{"id":120332,"date":"2021-02-15T06:58:35","date_gmt":"2021-02-15T06:58:35","guid":{"rendered":"https:\/\/www.indcareer.com\/schools\/?p=120332"},"modified":"2023-09-15T11:52:55","modified_gmt":"2023-09-15T11:52:55","slug":"ncert-solutions-for-8th-class-maths-chapter-8-comparing-quantities","status":"publish","type":"post","link":"https:\/\/www.indcareer.com\/schools\/ncert-solutions-for-8th-class-maths-chapter-8-comparing-quantities\/","title":{"rendered":"NCERT Solutions for 8th Class Maths: Chapter 8-Comparing Quantities"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\" id=\"h-ncert-solutions-for-8th-class-maths-chapter-8-comparing-quantities\"><strong>NCERT Solutions for 8th Class Maths: Chapter 8-Comparing Quantities<\/strong><\/h2>\n\n\n\n<p>Page No: 119<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-exercise-8-1\">Exercise 8.1<\/h2>\n\n\n\n<p><strong>1. Find the ratio of the following:<br>(a) Speed of a cycle 15 km per hour to the speed of scooter 30 km per hour.<\/strong><\/p>\n\n\n\n<p><strong>(b) 5 m to 10 km<br>(c) 50 paise to Rs. 5<\/strong><\/p>\n\n\n\n<p><strong>Solution<\/strong><\/p>\n\n\n\n<p>(a) Speed of cycle = 15 km\/hr<br>Speed of scooter = 30 km\/hr<br>Hence ratio of speed of cycle to that of scooter = 15 : 30 = 15\/30 = 1\/2= 1 : 2<\/p>\n\n\n\n<p>(b) \u2235 1 km = 1000 m<br>\u2234 10 km = 10\u00d71000 = 10000 m<br>\u2234 Ratio = 5m\/10000m = 1\/2000 = 1 : 2000<\/p>\n\n\n\n<p>(c) \u2235 Rs 1 = 100 paise<br>\u2234 Rs 5 = 5\u00d7 100 = 500 paise<br>Hence Ratio = 50 paise\/ 500 paise = 1\/10 = 1 : 10<\/p>\n\n\n\n<p><strong>2. Convert the following ratios to percentages:<br>(a) 3 : 4<\/strong><\/p>\n\n\n\n<p><strong>(a) Percentage of 3 : 4 = 3\/4 \u00d7100 % = 75%<br>(b) Percentage of 2 : 3 = 2\/3 \u00d7 100% = 66.2\/3%<\/strong><\/p>\n\n\n\n<p><strong>3. 72% of 25 students are good in mathematics. How many are not good in mathematics?<\/strong><\/p>\n\n\n\n<p><strong>Solution<\/strong><\/p>\n\n\n\n<p>Total number of students = 25<br>Number of good students in mathematics = 72% of 25 = 72\/100 \u00d725 = 18<br>Number of students not good in mathematics = 25 \u2013 18 = 7<br>Hence percentage of students not good in mathematics = 7\/25 \u00d7 100 = 28%<\/p>\n\n\n\n<p><strong>4. A football team won 10 matches out of the total number of matches they played. If their win percentage was 40, then how many matches did they play in all?<\/strong><\/p>\n\n\n\n<p><strong>Solution<\/strong><\/p>\n\n\n\n<p>Let total number of matches be x.<br>According to question,<br>40% of total matches = 10<br>\u21d2 40% of x = 10<br>\u21d2 40\/100 \u00d7 x = 10<br>\u21d2 x = (10\u00d7100)\/40 = 25<br>Hence total number of matches are 25.<\/p>\n\n\n\n<p><strong>5. If Chameli had Rs. 600 left after spending 75% of her money, how much money did she have in the beginning?<\/strong><\/p>\n\n\n\n<p><strong>Solution<\/strong><\/p>\n\n\n\n<p>Total percentage of money she didn&#8217;t spent = 100% &#8211; 75%=25%<br>According to question,<br>25% = 600<br>1% = 600\/25<br>100% = 600\/ 25 \u00d7 100<br>Hence the money in the beginning was Rs 2,400.<\/p>\n\n\n\n<p><strong>6. If 60% people in a city like cricket, 30% like football and the remaining like other games, then what percent of the people like other games? If the total number of people are 50 lakh, find the exact number who like each type of game.<\/strong><\/p>\n\n\n\n<p><strong>Solution<\/strong><\/p>\n\n\n\n<p>Number of people who like cricket = 60%<br>Number of people who like football = 30%<br>Number of people who like other games = 100% \u2013 (60% + 30%) = 10%<br>Now, Number of people who like cricket = 60% of 50,00,000 = 60\/100 \u00d7 50,00,000 = 30,00,000<br>And Number of people who like football = 30% of 50,00,000 = 30\/100 \u00d7 50,00,000 = 15,00,000<br>\u2234 Number of people who like other games = 10% of 50,00,000 = 10\/100 \u00d7 50,00,000 = 5,00,000<br>Hence, number of people who like other games are 5 lakh.<\/p>\n\n\n\n<p>Pg No. 125<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-exercise-8-2\">Exercise 8.2<\/h2>\n\n\n\n<p><strong>1. A man got 10% increase in his salary. If his new salary is Rs.1,54,000, find his original salary.<\/strong><\/p>\n\n\n\n<p><strong>Solution<\/strong><\/p>\n\n\n\n<p>Let original salary be Rs.100.<br>Therefore New salary i.e., 10% increase<br>= 100 + 10 = Rs.110<br>\u2235 New salary is Rs.110, when original salary = Rs.100<br>\u2234 New salary is Rs.1, when original salary = 100\/110<br>\u2234 New salary is Rs.1,54,000, when original salary = 100\/110 \u00d7 154000 = Rs.1,40,000<br>Hence original salary is Rs. 1,40,000.<\/p>\n\n\n\n<p><strong>2. On Sunday 845 people went to the Zoo. On Monday only 169 people went. What is the percent decrease in the people visiting the Zoo on Monday?<\/strong><\/p>\n\n\n\n<p><strong>Solution<\/strong><\/p>\n\n\n\n<p>On Sunday, people went to the Zoo = 845<br>On Monday, people went to the Zoo = 169<br>Number of decrease in the people = 845 \u2013 169 = 676<br>Decrease percent = 676\/845 \u00d7100 = 80%<br>Hence decrease in the people visiting the Zoo is 80%.<\/p>\n\n\n\n<p><strong>3. A shopkeeper buys 80 articles for Rs.2,400 and sells them for a profit of 16%. Find the selling price of one article.<\/strong><\/p>\n\n\n\n<p><strong>Solution<\/strong><\/p>\n\n\n\n<p>No. of articles = 80<br>Cost Price of articles = Rs. 2,400<br>And Profit = 16%<br>\u2235 Cost price of articles is Rs.100, then selling price = 100 + 16 = Rs.116<br>\u2234 Cost price of articles is Rs.1, then selling price = 116\/100<br>\u2234 Cost price of articles is Rs.2400, then selling price = 116\/100 \u00d7 2400 = Rs.2784<br>Hence, Selling Price of 80 articles = Rs.2784<br>Therefore Selling Price of 1 article = 2784\/80 = Rs.34.80<\/p>\n\n\n\n<p><strong>4. The cost of an article was Rs.15,500, Rs.450 were spent on its repairs. If it sold for a profit of 15%, find the selling price of the article.<\/strong><\/p>\n\n\n\n<p><strong>Solution<\/strong><\/p>\n\n\n\n<p>Here, C.P. = Rs.15,500 and Repair cost = Rs.450<br>Therefore Total Cost Price = 15500 + 450 = Rs.15,950<br>Let C.P. be Rs.100, then S.P. = 100 + 15 = Rs.115<br>When C.P. is Rs.100, then S.P. = Rs.115<br>\u2234 When C.P. is Rs.1, then S.P. = 115\/100<br>\u2234 When C.P. is Rs.15950, then S.P. =115\/100 \u00d7 15950 = Rs.18,342.50<\/p>\n\n\n\n<p><strong>5. A VCR and TV were bought for Rs.8,000 each. The shopkeeper made a loss of 4% on the VCR and a profit of 8% on the TV. Find the gain or loss percent on the whole transaction.<\/strong><\/p>\n\n\n\n<p><strong>Solution<\/strong><\/p>\n\n\n\n<p>Cost price of VCR = Rs.8000 and Cost price of TV = Rs.8000<br>Total Cost Price of both articles = Rs.8000 + Rs.8000 = Rs. 16,000<br>Now, VCR is sold at 4% loss.<br>Let C.P. of each article be Rs.100, then S.P. of VCR = 100 \u2013 4 = Rs.96<br>When C.P. is Rs.100, then S.P. = Rs.96<br>\u2234 When C.P. is Rs.1, then S.P. = 96\/100<br>\u2234 When C.P. is Rs.8000, then S.P. = 96\/100 \u00d78000 = Rs.7,680<br>And TV is sold at 8% profit, then S.P. of TV = 100 + 8 = Rs.108<br>When C.P. is Rs.100, then S.P. = Rs.108<br>\u2234 When C.P. is Rs.1, then S.P. = 108\/100<br>\u2234 When C.P. is Rs.8000, then S.P. = 108\/100 \u00d7 8000 = Rs.8,640<br>Then, Total S.P. = Rs.7,680 + Rs.8,640 = Rs. 16,320<br>Since S.P. &gt;C.P.,<br>Therefore Profit = S.P. \u2013 C.P. = 16320 \u2013 16000 = Rs.320<br>And Profit% = Profit\/ cost price \u00d7 100&nbsp;= 320\/16000 \u00d7 100 = 2%<br>Therefore,the shopkeeper had a gain of 2% on the whole transaction.<\/p>\n\n\n\n<p><strong>6. During a sale, a shop offered a discount of 10% on the marked prices of all the items. What would a customer have to pay for a pair of jeans marked at Rs.1450and two shirts marked at Rs.850 each?<\/strong><\/p>\n\n\n\n<p><strong>Solution<\/strong><\/p>\n\n\n\n<p>Rate of discount on all items = 10%<br>Marked Price of a pair of jeans = Rs.1450 and Marked Price of a shirt = Rs.850<br>Discount on a pair of jeans = (Rate \u00d7 M.P)\/100 = (10\u00d71450)\/100 = Rs.145<br>\u2234 S.P. of a pair of jeans = Rs.1450 \u2013 Rs.145 = Rs.1305<br>Marked Price of two shirts = 2\u00d7 850 = Rs.1700<br>Discount on two shirts = (Rate \u00d7 M.P)\/100 = (10 \u00d7 1700)\/100 = Rs.170<\/p>\n\n\n\n<p>\u2234 S.P. of two shirts = Rs.1700 \u2013 Rs.170 = Rs.1530<br>Therefore the customer had to pay = 1305 + 1530&nbsp;<\/p>\n\n\n\n<p>= Discount on a pair of jeans&nbsp;<\/p>\n\n\n\n<p>= (Rate \u00d7 M.P)\/100&nbsp;<\/p>\n\n\n\n<p>= (10\u00d71450)\/100&nbsp;= Rs.145<br>\u2234 S.P. of a pair of jeans = Rs.1450 \u2013 Rs.145 = Rs.2,835<br>Thus,the customer will have to pay Rs.2,835<\/p>\n\n\n\n<p><strong>7. A milkman sold two of his buffaloes for Rs.20,000 each. On one he made a gain of 5% and on the other a loss of 10%. Find his overall gain or loss. (Hint: Find CP of each)<\/strong><\/p>\n\n\n\n<p><strong>Solution<\/strong><\/p>\n\n\n\n<p>S.P. of each buffalo = Rs.20,000<br>S.P. of two buffaloes = 20,000\u00d72 = Rs.40,000<\/p>\n\n\n\n<p>One buffalo is sold at 5% gain.<br>Let C.P. be Rs.100, then S.P. = 100 + 5 = Rs.105<br>When S.P. is Rs.105, then C.P. = Rs.100<br>\u2234 When S.P. is Rs.1, then C.P. = 100\/105<br>\u2234 When S.P. is Rs.20,000, then C.P. = 100\/105 \u00d7 20000 = Rs.19,047.62<br>Another buffalo is sold at 10% loss.<br>Let C.P. be Rs.100, then S.P. = 100 \u2013 10 = Rs.90<br>When S.P. is Rs.90, then C.P. = Rs.100<br>\u2234 When S.P. is Rs.1, then C.P. = 100\/90<br>\u2234 When S.P. is Rs.20,000, then C.P. = 100\/90 \u00d7 20000 = Rs.22,222.22<br>Total C.P. = Rs.19,047.62 + Rs.22,222.22 = Rs.41,269.84<br>Since C.P. &gt;S.P.<br>Therefore here it is loss.<br>Loss = C.P. \u2013 S.P. = Rs.41,269.84 \u2013 Rs. 40,000.00 = Rs.1,269.84<br>The overall loss of milkman was Rs.1269.84<\/p>\n\n\n\n<p><strong>8. The price of a TV is Rs.13,000. The sales tax charged on it is at the rate of 12%. Find the amount that Vinod will have to pay if he buys it.<\/strong><\/p>\n\n\n\n<p><strong>Solution<\/strong><\/p>\n\n\n\n<p>C.P. = Rs.13,000 and S.T. rate = 12%<br>Let C.P. be Rs.100, then S.P. for purchaser = 100 + 12 = Rs.112<br>When C.P. is Rs.100, then S.P. = Rs.112<br>\u2234 When C.P. is Rs.1, then S.P. = 112\/100<br>\u2234 When C.P. is Rs.13,000, then S.P. = 112\/100 \u00d7 13000 = Rs.14,560<br>He will have to pay Rs.14,560<\/p>\n\n\n\n<p><strong>9. Arun bought a pair of skates at a sale where the discount given was 20%. If the amount he pays is Rs.1,600, find the marked price.<\/strong><\/p>\n\n\n\n<p><strong>Solution<\/strong><\/p>\n\n\n\n<p>S.P. = Rs.1,600 and Rate of discount = 20%<br>Let M.P. be Rs.100, then S.P. for customer = 100 \u2013 20 = Rs.80<br>When S.P. is Rs.80, then M.P. = Rs.100<br>\u2234 When S.P. is Rs.1, then M.P. = 100\/80<br>\u2234 When S.P. is Rs.1600, then M.P. = 100\/ 80 \u00d7 1600 = Rs.2,000<br>Thus, the marked price was Rs. 2,000<\/p>\n\n\n\n<p><strong>10. I purchased a hair-dryer for Rs.5,400 including 8% VAT. Find the price before VAT was added.<\/strong><\/p>\n\n\n\n<p><strong>Solution<\/strong><\/p>\n\n\n\n<p>C.P. = Rs.5,400 and Rate of VAT = 8%<br>Let C.P. without VAT is Rs. 100, then price including VAT = 100 + 8 = Rs.108<br>When price including VAT is Rs.108, then original price = Rs.100<br>\u2234 When price including VAT is Rs.1, then original price = 100\/108<br>\u2234 When price including VAT is Rs.5400, then original price = 100\/108 \u00d7 5400 = Rs.5000<br>Thus, the price of Hair Dryer before the addition of VAT was Rs 5000<\/p>\n\n\n\n<p>Pg No. 133<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-exercise-8-3\">Exercise 8.3<\/h2>\n\n\n\n<p><strong>1. Calculate the amount and compound interest on:<br>(a) Rs.10,800 for 3 years at 12.1\/2% per annum compounded annually.<br>(b) Rs.18,000 for 2.1\/2 years at 10% per annum compounded annually.<br>(c) Rs.62,500 for 1.1\/2 years at 8% per annum compounded annually.<br>(d) Rs.8,000 for 1 years at 9% per annum compounded half yearly. (You could the year by year calculation using S.I. formula to verify).<br>(e) Rs.10,000 for 1 years at 8% per annum compounded half yearly.<\/strong><\/p>\n\n\n\n<p><strong>Solution<\/strong><\/p>\n\n\n\n<p>(a) Here, Principal (P) = Rs. 10800,<br>Time(n) = 3 years,<br>Rate of interest (R) = 12.1\/2% = 25\/2 %<br>Amount (A) = <img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/24.png\"><br>= <img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/2u5.png\">=<img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/26.png\"><br>= <img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/26.png\">= <img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/28.png\"><br>= 10800 \u00d7 9\/8 \u00d7 9\/8 \u00d7 9\/8<br>= Rs. 15,377.34 (approx.)<br>Compound Interest (C.I.) = A \u2013 P<br>= Rs. 10800 \u2013 Rs. 15377.34 = Rs. 4,577.34<\/p>\n\n\n\n<p>(b) Here, Principal (P) = Rs. 18,000, Time (n) = 2.1\/2 years, Rate of interest (R) = 10% p.a.<br>Amount (A) = <img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/24l.png\"><br>= <img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/jh.png\">= <img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/30.png\"><br>= 18000(11\/10)<sup>2<\/sup> = 18000 \u00d7 11\/10 \u00d711\/10<br>= Rs. 21,780<br>Interest for 1\/2 years on Rs. 21,780 at rate of 10% = (21780\u00d710\u00d71)\/100 = Rs. 1,089<br>Total amount for 2.1\/2 years = Rs. 21,780 + Rs. 1089 = Rs. 22,869<br>Compound Interest (C.I.) = A \u2013 P = Rs. 22869 \u2013 Rs. 18000 = Rs. 4,869<\/p>\n\n\n\n<p>(c) Here, Principal (P) = Rs. 62500,<br>Time (n) = 1.1\/2 = 3\/2 years = 3 years (compounded half yearly)<br>Rate of interest (R) = 8% = 4% (compounded half yearly)<br>Amount (A) = <img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/2x4.png\"><br>= <img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/31.png\"><br>= <img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/32.png\"><br>= 62500 (26\/25)<sup>3<\/sup><br>= 62500 \u00d7 26\/25 \u00d7 26\/25 \u00d7 26\/25<br>= Rs. 70,304<br>Compound Interest (C.I.) = A \u2013 P = Rs. 70304 \u2013 Rs. 62500 = Rs. 7,804<\/p>\n\n\n\n<p>(d) Here, Principal (P) = Rs. 8000,<br>Time (n) = 1 years = 2 years(compounded half yearly)<br>Rate of interest (R) = 9% = 9\/2 % (compounded half yearly)<br>Amount (A) = <img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/24gt.png\"><br>= <img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/33x.png\"><br>= <img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/34.png\"><br>= 8000 (209\/200)<sup>2<\/sup><br>= 8000 \u00d7 209\/200 \u00d7 209\/200<br>= Rs. 8,736.20<br>Compound Interest (C.I.) = A \u2013 P = Rs. 8736.20 \u2013 Rs. 8000 = Rs. 736.20<\/p>\n\n\n\n<p>(e) Here, Principal (P) = Rs. 10,000,<br>Time (n) = 1 years = 2 years (compounded half yearly)<br>Rate of interest (R) = 8% = 4% (compounded half yearly)<br>Amount (A) = <img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/24s.png\"><br>= <img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/3x5.png\"><br>= <img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/36.png\"><br>= 10000 (26\/25)<sup>2<\/sup><br>= 10000 \u00d7 26\/26 \u00d7 26\/25<br>= Rs. 10,816<br>Compound Interest (C.I.) = A \u2013 P = Rs. 10,816 \u2013 Rs. 10,000 = Rs. 816<\/p>\n\n\n\n<p><strong>2. Kamala borrowed Rs.26,400 from a Bank to buy a scooter at a rate of 15% p.a. compounded yearly. What amount will she pay at the end of 2 years and 4 months to clear the loan?<br>(Hint: Find A for 2 years with interest is compounded yearly and then find SI on the 2nd year amount for 4\/12 years).<\/strong><\/p>\n\n\n\n<p><strong>Solution<\/strong><\/p>\n\n\n\n<p>Here, Principal (P) = Rs. 26,400,<br>Time(n) = 2 years 4 months,<br>Rate of interest (R) = 15% p.a.<br>Amount for 2 years (A) = <img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/2s4.png\"><br>= <img decoding=\"async\" src=\"hhttps:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/37.png\">= <img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/38.png\"><br>= 26400(23\/20)<sup>2<\/sup>&nbsp;= 26400 \u00d7 23\/20 \u00d7 23\/20<br>= Rs. 34,914<br>Interest for 4 months = 4\/12 = 1\/3 years at the rate of 15% = (34914 \u00d7 15\u00d71)\/100<br>= Rs. 1745.70<br>\u2234Total amount = Rs. 34,914 + Rs. 1,745.70 = Rs. 36,659.70<\/p>\n\n\n\n<p><strong>3. Fabina borrows Rs.12,500 per annum for 3 years at simple interest and Radha borrows the same amount for the same time period at 10% per annum, compounded annually. Who pays more interest and by how much?<\/strong><\/p>\n\n\n\n<p><strong>Solution<\/strong><\/p>\n\n\n\n<p>Here, Principal (P) = Rs.12,500,<br>Time (T) = 3 years,<br>Rate of interest (R) = 12% p.a.<br>Simple Interest for Fabina =&nbsp;<img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/class8-maths-ncert-solutions-for-comparing-quantities-1.png\">=&nbsp;<img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/class8-maths-ncert-solutions-for-comparing-quantities-2.png\">&nbsp;= Rs. 4,500<br>Amount for Radha, P = Rs. 12,500, R = 10% and&nbsp; n = 3 years<br>Amount (A)&nbsp; =&nbsp;<img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/class8-maths-ncert-solutions-for-comparing-quantities-3.png\"><br>=&nbsp;<img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/class8-maths-ncert-solutions-for-comparing-quantities-4.png\">&nbsp;=<img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/class8-maths-ncert-solutions-for-comparing-quantities-5.png\"><br>=&nbsp;<img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/class8-maths-ncert-solutions-for-comparing-quantities-6.png\">&nbsp;=&nbsp;<img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/class8-maths-ncert-solutions-for-comparing-quantities-7.png\"><br>= Rs. 16,637.50<\/p>\n\n\n\n<p>C. I. for Radha = A \u2013 P<br>= Rs. 16,637.50 \u2013 Rs. 12,500 = Rs. 4,137.50<br>Thus, Fabina pays more interest = Rs. 4,500 \u2013 Rs. 4,137.50 = Rs. 362.50<\/p>\n\n\n\n<p><strong>4. I borrows Rs.12,000 from Jamshed at 6% per annum simple interest for 2 years. Had I borrowed this sum at 6% per annum compound interest, what extra amount would I have to pay?<\/strong><\/p>\n\n\n\n<p><strong>Solution<\/strong><\/p>\n\n\n\n<p>Here, Principal (P) = Rs.12,000,<\/p>\n\n\n\n<p>Time (T) = 2 years,&nbsp;<\/p>\n\n\n\n<p>Rate of interest (R) = 6% p.a.<br>Simple Interest = (P\u00d7R\u00d7T)\/100<br>= (12000 \u00d7 6\u00d7 2)\/100 = Rs. 1,440<br>Had he borrowed this sum at 6% p.a., then<br>Compound Interest =<img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/gu.png\">&#8211; P<br>= <img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/39.png\"><br>= <img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/40.png\"><br>= 12000(53\/50)<sup>2<\/sup>&nbsp;&#8211; 12000<br>= 12000 \u00d7 53\/50 \u00d7 53\/50 &#8211; 12000<br>= Rs. 13,483.20 \u2013 Rs. 12,000<br>= Rs. 1,483.20<br>Difference in both interests = Rs. 1,483.20 \u2013 Rs. 1,440.00 = Rs. 43.20<br>Thus ,the extra amount to be paid is Rs.43.20<\/p>\n\n\n\n<p><strong>5. Vasudevan invested Rs.60,000 at an interest rate of 12% per annum compounded half yearly. What amount would he get:<br>(i) after 6 months?<br>(ii) after 1 year?<\/strong><\/p>\n\n\n\n<p><strong>Solution<\/strong><\/p>\n\n\n\n<p>(i) Here, Principal (P) = Rs. 60,000,<br>Time (n)= 6 months = 1 year(compounded half yearly)<br>Rate of interest (R) = 12% = 6% (compounded half yearly)<br>Amount (A) = <img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/24k.png\"><br>= <img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/41.png\"><br>= <img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/42.png\"><br>= 60000 (53\/50)<sup>1<\/sup><br>= 60000 \u00d7 53\/50<br>= Rs. 63,600<br>After 6 months Vasudevan would get amount Rs. 63,600.<\/p>\n\n\n\n<p>(ii) Here, Principal (P) = Rs. 60,000,<br>Time (n) = 1 year = 2 year(compounded half yearly)<br>Rate of interest (R) = 12% = 6% (compounded half yearly)<br>Amount (A) = <img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/24k.png\"><br>= <img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/uv44.png\"><br>= <img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/43.png\"><br>= 60000(53\/50)<sup>2<\/sup><br>= 60000 \u00d7 53\/50 \u00d7 53\/50<br>= Rs. 67,416<br>After 1 year Vasudevan would get amount Rs. 67,416.<\/p>\n\n\n\n<p><strong>6. Arif took a loan of Rs.80,000 from a bank. If the rate of interest is 10% per annum, find the difference in amounts he would be paying after 1.1\/2 years if the interest is:<br>(i) compounded annually.<br>(ii) compounded half yearly.<\/strong><\/p>\n\n\n\n<p><strong>Solution<\/strong><\/p>\n\n\n\n<p>(i) Here, Principal (P) = Rs. 80,000&nbsp;<\/p>\n\n\n\n<p>Time (n)= 1.1\/2 years,&nbsp;<\/p>\n\n\n\n<p>Rate of interest (R) = 10%<br>Amount for 1 year (A) = <img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/24k.png\"><br>= <img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/45.png\"><br>=<img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/46.png\"><br>= 80000 (11\/10)<sup>1<\/sup><br>= Rs. 88,000<br>Interest for 1\/2 year = (88000\u00d710\u00d71)\/(100\u00d72)&nbsp;= Rs. 4,400<br>Total amount = Rs. 88,000 + Rs. 4,400 = Rs. 92,400<\/p>\n\n\n\n<p>(ii) Here, Principal (P) = Rs.80,000,<br>Time (n) = 1.1\/2 year = 3\/2 years (compounded half yearly)<br>Rate of interest (R) = 10% = 5% (compounded half yearly)<br>Amount (A) = <img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/24k.png\"><br>= <img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/47.png\"><br>= <img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/48.png\"><br>= 80000(21\/20)<sup>3<\/sup><br>= 80000 \u00d7 21\/20 \u00d7 21\/20 \u00d7 21\/20<br>= Rs. 92,610<br>Difference in amounts = Rs. 92,610 \u2013 Rs. 92,400 = Rs. 210<\/p>\n\n\n\n<p><strong>7. Maria invested Rs.8,000 in a business. She would be paid interest at 5% per annum compounded annually. Find:<br>(i) The amount credited against her name at the end of the second year.<br>(ii) The interest for the third year.<\/strong><\/p>\n\n\n\n<p><strong>Solution<\/strong><\/p>\n\n\n\n<p>(i) Here, Principal (P) = Rs. 8000, Rate of Interest (R) = 5%, Time (n) = 2 years<br>Amount (A) = <img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/24k.png\"><br>= <img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/51.png\"><br>= <img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/52.png\"><br>= 8000(21\/20)<sup>2<\/sup><br>= 8000 \u00d7 21\/20 \u00d7 21\/20<br>= Rs. 8,820<\/p>\n\n\n\n<p>(ii) Here, Principal (P) = Rs. 8000, Rate of Interest (R) = 5%, Time (n) = 3 years<br>Amount (A) = <img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/24k.png\"><br>= <img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/54.png\"><br>= <img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/53.png\"><br>= 8000(21\/20)<sup>3<\/sup><br>= 8000 \u00d7 21\/20 \u00d7 21\/20 \u00d7 21\/20<br>= Rs. 9,261<br>Interest for 3rd year = A \u2013 P = Rs. 9,261 \u2013 Rs. 8,820 = Rs. 441<\/p>\n\n\n\n<p><strong>8. Find the amount and the compound interest on Rs.10,000 for 1.1\/2 years at 10% per annum, compounded half yearly.<br>Would this interest be more than the interest he would get if it was compounded annually?<\/strong><\/p>\n\n\n\n<p><strong>Solution<\/strong><\/p>\n\n\n\n<p>Here, Principal (P) = Rs. 10000,&nbsp;<\/p>\n\n\n\n<p>Rate of Interest (R) = 10% = 5% (compounded half yearly)<br>Time (n) = 1.1\/2 years = 3 years (compounded half yearly)<br>Amount (A) = <img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/24k.png\"><br>= <img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/5yu5.png\"><br>= <img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/56.png\"><br>= 10000 (21\/20)<sup>3<\/sup><br>= 10000 \u00d7 21\/20 \u00d7 21\/20 \u00d7 21\/20<br>= Rs. 11,576.25<br>Compound Interest (C.I.) = A \u2013 P = Rs. 11,576.25 \u2013 Rs. 10,000 = Rs. 1,576.25<\/p>\n\n\n\n<p>If it is compounded annually, then<br>Here, Principal (P) = Rs. 10000<\/p>\n\n\n\n<p>Rate of Interest (R) = 10%,&nbsp;<\/p>\n\n\n\n<p>Time (n) = 1.1\/2years<\/p>\n\n\n\n<p>Amount (A) for 1 year = <img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/24k.png\"><\/p>\n\n\n\n<p>= <img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/58.png\"><br>= <img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/58.png\"><br>= 10000(11\/10)<sup>1<\/sup><br>= 10000 \u00d7 11\/10<br>= Rs. 11,000<\/p>\n\n\n\n<p>Interest for 1\/2 year = (11000 \u00d7 1 \u00d7 10)\/(2\u00d7100) = Rs. 550<br>\u2234 Total amount = Rs. 11,000 + Rs. 550 = Rs. 11,550<br>Now, C.I. = A \u2013 P = Rs. 11,550 \u2013 Rs. 10,000 = Rs. 1,550<br>Yes, interest Rs. 1,576.25 is more than Rs. 1,550.<\/p>\n\n\n\n<p><strong>9. Find the amount which Ram will get on Rs.4,096, if he gave it for 18 months at 12.1\/2% per annum, interest being compounded half yearly.<\/strong><\/p>\n\n\n\n<p><strong>Solution<\/strong><\/p>\n\n\n\n<p>Here, Principal (P) = Rs. 4096,<br>Rate of Interest (R) = 12.1\/2 = 25\/2%&nbsp;= 25\/4% (compounded half yearly)<br>Time (n)= 18 months = 1.1\/2 years = 3 years (compounded half yearly)<br>Amount (A) = <img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/24k.png\"><br>= <img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/59.png\"><br>= <img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/60.png\"><br>= 4096(17\/16)<sup>3<\/sup><\/p>\n\n\n\n<p>= 4096 \u00d7 17\/16 \u00d7 17\/16 \u00d7 17\/16<br>= Rs. 4,913<\/p>\n\n\n\n<p><strong>10. The population of a place increased to 54,000 in 2003 at a rate of 5% per annum.<br>(i) Find the population in 2001.<br>(ii) What would be its population in 2005?<\/strong><\/p>\n\n\n\n<p><strong>Solution<\/strong><\/p>\n\n\n\n<p>(i) Here, A<sub>2003<\/sub> = Rs. 54,000,&nbsp;<\/p>\n\n\n\n<p>R = 5%,&nbsp;<\/p>\n\n\n\n<p>n = 2 years<br>Population would be less in 2001 than 2003 in two years.<br>Here population is increasing.<br>\u2234 A<sub>2003<\/sub>&nbsp;= <img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/61.png\"><\/p>\n\n\n\n<p>\u21d2 54000 = <img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/63.png\"><br>\u21d2 54000 = <img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/64.png\"><br>\u21d2 54000 = P<sub>2001<\/sub>(21\/20)<sup>2<\/sup><br>\u21d2 54000 = P<sub>2001<\/sub>&nbsp;\u00d721\/20 \u00d7 21\/20<br>\u21d2 P<sub>2001<\/sub>&nbsp;= (54000 \u00d7 20 \u00d7 20)\/(21 \u00d7 21) =48,979.5<br>\u21d2 P<sub>2001<\/sub>&nbsp;= 48,980 (approx.)<\/p>\n\n\n\n<p>(ii) According to question, population is increasing.<br>Therefore population in 2005,<br>A<sub>2015<\/sub>&nbsp;= <img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/o24.png\"><br>= 54000 (1 + 5\/100)<sup>2<\/sup><br>= 54000(1+1\/20)<sup>2<\/sup><br>= 54000(21\/20)<sup>2<\/sup><br>= 54000 \u00d7 21\/20 \u00d7 21\/20<br>= 59,535<br>Hence population in 2005 would be 59,535.<\/p>\n\n\n\n<p><strong>11. In a laboratory, the count of bacteria in a certain experiment was increasing at the rate of 2.5% per hour. Find the bacteria at the end of 2 hours if the count was initially 5,06,000.<\/strong><\/p>\n\n\n\n<p><strong>Solution<\/strong><\/p>\n\n\n\n<p>Here, Principal (P) = 5,06,000,<br>Rate of Interest (R) = 2.5%,<br>Time (n) = 2 hours<br>After 2 hours, number of bacteria,<br>Amount (A) = <img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/o24.png\"><br>= 506000(1+ 2.5\/100)<sup>2<\/sup><br>= 506000(1+25\/1000)<sup>2<\/sup><br>= 506000(1+1\/40)<sup>2<\/sup><br>= 506000(41\/40)<sup>2<\/sup><br>= 506000 \u00d7 41\/40 \u00d7 41\/40<br>= 5,31,616.25<br>Hence, number of bacteria after two hours are 531616 (approx.).<\/p>\n\n\n\n<p><strong>12. A scooter was bought at Rs.42,000. Its value depreciated at the rate of 8% per annum. Find its value after one year.<\/strong><\/p>\n\n\n\n<p><strong>Solution<\/strong><\/p>\n\n\n\n<p>Here, Principal (P) = Rs. 42,000,<br>Rate of Interest (R) = 8%,<br>Time (n) = 1 years<\/p>\n\n\n\n<p>Amount (A) = P ( 1 &#8211; R\/100)<sup>n<\/sup><br>= 42000(1 &#8211; 8\/100)<sup>1<\/sup><br>= 42000(1+ 2\/25)<sup>1<\/sup><br>= 42000 (27\/25)<sup>1<\/sup><br>= 42000 \u00d7 27\/25<br>= Rs. 38,640<br>Hence, the value of scooter after one year is Rs. 38,640.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-chapterwise-ncert-solutions-for-8th-class-maths\">Chapterwise NCERT Solutions for 8th Class Maths<\/h2>\n\n\n\n<p><a href=\"https:\/\/www.indcareer.com\/schools\/ncert-solutions-for-8th-class-maths-chapter-1-rational-numbers\/?_gl=1*1h2rcfz*_ga*YW1wLTJFME1oOGhtWEJEMllnWUlLR29aR2c.\">Chapter 1 \u2013 Rational Numbers<\/a><br><a href=\"https:\/\/www.indcareer.com\/schools\/ncert-solutions-for-8th-class-maths-chapter-2-linear-equations-in-one-variable-part-ii\/\">Chapter 2 \u2013 Linear Equations in One Variable<\/a><br><a href=\"https:\/\/www.indcareer.com\/schools\/ncert-solutions-for-8th-class-maths-chapter-3-understanding-quadrilaterals\/\">Chapter 3 \u2013 Understanding Quadrilaterals<\/a><br><a href=\"https:\/\/www.indcareer.com\/schools\/ncert-solutions-for-8th-class-maths-chapter-4-practical-geometry\/\">Chapter 4 \u2013 Practical Geometry<\/a><br><a href=\"https:\/\/www.indcareer.com\/schools\/ncert-solutions-for-8th-class-maths-chapter-5-data-handling\/\">Chapter 5 \u2013 Data Handling<\/a><br><a href=\"https:\/\/www.indcareer.com\/schools\/ncert-solutions-for-8th-class-maths-chapter-6-squares-and-square-roots\/\">Chapter 6 \u2013 Squares and Square Roots<\/a><br><a href=\"https:\/\/www.indcareer.com\/schools\/ncert-solutions-for-8th-class-maths-chapter-7-cubes-and-cube-roots\/\">Chapter 7 \u2013 Cubes and Cube Roots<\/a><br><a href=\"https:\/\/www.indcareer.com\/schools\/ncert-solutions-for-8th-class-maths-chapter-8-comparing-quantities\/\">Chapter 8 \u2013 Comparing Quantities<\/a><br><a href=\"https:\/\/www.indcareer.com\/schools\/ncert-solutions-for-8th-class-maths-chapter-9-algebraic-expressions-and-identities\/\">Chapter 9 \u2013 Algebraic Expressions and Identities<\/a><br><a href=\"https:\/\/www.indcareer.com\/schools\/ncert-solutions-for-8th-class-maths-chapter-10-visualising-solid-shapes\/\">Chapter 10 \u2013 Visualizing Solid Shapes<\/a><br><a href=\"https:\/\/www.indcareer.com\/schools\/ncert-solutions-for-8th-class-maths-chapter-11-mensuration\/\">Chapter 11 \u2013 Mensuration<\/a><br><a href=\"https:\/\/www.indcareer.com\/schools\/ncert-solutions-for-8th-class-maths-chapter-12-exponents-and-powers\/\">Chapter 12 \u2013 Exponents and Powers<\/a><br><a href=\"https:\/\/www.indcareer.com\/schools\/ncert-solutions-for-8th-class-maths-chapter-13-direct-and-inverse-proportions\/\">Chapter 13 \u2013 Direct and Inverse Proportions<\/a><br><a href=\"https:\/\/www.indcareer.com\/schools\/ncert-solutions-for-8th-class-maths-chapter-14-factorisation\/\">Chapter 14 \u2013 Factorization<\/a><br><a href=\"https:\/\/www.indcareer.com\/schools\/ncert-solutions-for-8th-class-maths-chapter-15-introduction-to-graphs\/\">Chapter 15 \u2013 Introduction to Graphs<\/a><br><a href=\"https:\/\/www.indcareer.com\/schools\/ncert-solutions-for-8th-class-maths-chapter-16-playing-with-numbers\/\">Chapter 16 \u2013 Playing with Numbers<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-about\">About<\/h2>\n\n\n\n<p>The National Council of Educational Research and Training is an autonomous organization of the Government of India which was established in 1961 as a literary, scientific, and charitable Society under the Societies Registration Act. Its headquarters are located at Sri Aurbindo Marg in New Delhi. <a href=\"https:\/\/ncert.nic.in\/\" target=\"_blank\" rel=\"noreferrer noopener\">Visit the Official NCERT website<\/a> to learn more. <\/p>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link has-primary-background-color has-background wp-element-button\" href=\"https:\/\/www.indcareer.com\/schools\/ncert-solutions\/\">NCERT Solutions<\/a><\/div>\n\n\n\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link has-primary-background-color has-background wp-element-button\" href=\"https:\/\/www.indcareer.com\/schools\/ncert-class-viii\/\">NCERT Solutions for Class 8<\/a><\/div>\n\n\n\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link has-primary-background-color has-background wp-element-button\" href=\"https:\/\/www.indcareer.com\/schools\/ncert-solutions-for-class-8-maths\/\">NCERT Solutions for Class 8 Maths<\/a><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>NCERT Solutions for 8th Class Maths: Chapter 8-Comparing Quantities Page No: 119 Exercise 8.1 1. Find the ratio of the following:(a) Speed of a cycle 15 km per hour to the speed of scooter 30 km per hour. (b) 5 m to 10 km(c) 50 paise to Rs. 5 Solution (a) Speed of cycle = [&hellip;]<\/p>\n","protected":false},"author":302,"featured_media":627502,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"newspack_featured_image_position":"","newspack_post_subtitle":"","newspack_article_summary_title":"Overview:","newspack_article_summary":"","newspack_hide_updated_date":false,"newspack_show_updated_date":false,"footnotes":""},"categories":[1411,58],"tags":[1506],"boards":[1180],"class_list":["post-120332","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-book-solutions","category-class-8","tag-ncert-maths-class-8","boards-ncert","entry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.0 (Yoast SEO v27.1.1) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>NCERT Solutions for 8th Class Maths: Chapter 8-Comparing Quantities - IndCareer Schools<\/title>\n<meta name=\"description\" content=\"NCERT Solutions for 8th Class Maths: Chapter 8-Comparing Quantities Page No: 119 Exercise 8.1 1. 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