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Class 8 Math: Comparing Quantities
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MCQs on ratios and percentages, finding discounts and percentage, percentage estimations, profit and loss, sales tax or value added tax, compound interest, compound interest rates annually and compound interest formula applications.

Class 8 Math: Comparing Quantities
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25 Questions

1. The population of a sate decreases every year at the rate 4% per annum. The population of the state 3 years ago was 150000. Find present population.
2. The population of the town is 30000. The annual birth rate is 5% and the annual death rate is 3%. Calculate the population after 2 years.
3. The bacteria in a culture grows by 5% in the first hour, decreases by 10% in the second hour and increases by 2% in the third hour. If the original count of the bacteria is 50000, Calculate the count of bacteria at the end of 3 hours.
4. Calculate the compound interest on Rs. 4000 for 2 years at 20% per annum when compounded annually.
5. If 6% VAT is added in the price of a lawn mower at Rs. 15000 then what is the original price of the lawn mower?
6. What will be the bill amount of two sets of TV at Rs. 50000 each with a 7% of sales tax included?
7. Fe-57 decays at the constant rate in such a way that it reduces to 50% in 5568 years. Find the age of an old rod which the iron (Fe) is only 12.5% of the original.
8. The population of a city is increasing at the rate of 10% per annum. Calculate the population of the city on this basis after 3 years if the current population is 10000.
9. Rakesh has Rs. 50 and Karan has Rs. 1.5. Find the ratio of money with Rakesh and money with Karan.
10. Calculate 25% of 776.
11. The initial population of a country is 1000000. If the birth rate and the death rate is 10% and 4% respectively, then find the population of the country after 2 years.
12. At a shopping bonanza a 55% discount is offered on all its items. What would be the sale price of a shoe marked at Rs. 5000?
13. The value of a land increases every year at the rate of 8%. If its value at the end of 3 years be Rs 6000000, find its original value at the beginning of these years.
14. Find the amount on Rs. 5000 at the rate of 20% per annum for 18 months when interest is compounded half yearly.
15. Zayn bought tickets to concert for Rs. 3500. He wants to sell them at a discount of 15%. What is the discount in Rs.?
16. What will be the amount to be paid at the end of 18 months on Rs. 12000 at 4% per annum compounded quarterly?
17. Riya bought apples for Rs. 350. She sold them for Rs. 400. Find the percentage of profit made by Riya.
18. An engine has initially 24000 ml oil. The amount of oil has to be increased at the rate of 5% every six month. Find the time-period at the end of which the amount of oil becomes 27783ml.
19. Manish opened a cafe with an initial investment of Rs. 64000. In the first year he incurred the loss of 10%. During second year he gained the profit of 4% and in the third year he gained the profit of 15%. Calculate his net profit gained in the entire three years.
20. 10 books each of Rs. 300 are sold at Rs. 2500. What is the percentage of the discount given?
21. Two years ago the population of a village was 4000. If the annual increase during the two successive years be at the rate of 2% & 4%, find the present population.
22. Calculate 20% of 1266.
23. A dinner set is sold at Rs. 4500 after giving a discount of 15%. What is the marked price of the dinner set?
24. The price of bike is Rs. 75000 last year. The price increased by 20% this year. What is the price of bike this year?
25. What will be the amount to be paid at the end of 7 years on Rs. 3500 at 2% per annum compounded annually?