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Class 8 Maths Practice Test: Comparing Quantities - Applications of Compound Interest Formula
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Class 8 Maths Practice Test: Comparing Quantities - Applications of Compound Interest Formula
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23 Questions

1. Max bought a gadget for Rs. 21000. If the cost of the gadget after 2 years depreciates to Rs. 18162, find the rate of depreciation.
2. 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.
3. 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.
4. The production of spare parts rose to 25000 from 16000 in 2 years. Find the rate of growth per annum.
5. 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.
6. 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.
7. The annual rate of growth in population of a certain city is 10%. If its present population is 532400, find the population 3 years ago.
8. A new two-wheeler costs Rs. 90000. Its price depreciates at the rate of 10% a year during first two years and the rate of 25% a year thereafter. Find the cost of the two-wheeler after 3 years.
9. A company increased the production of cars from 15625 in 2002 to 27000 in 2005. Find the annual rate of growth of production of the cars.
10. 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.
11. The value of a gadget worth Rs.10000 is depreciating at the rate of 10% per annum. In how many years will its value be reduced to Rs 6561?
12. 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.
13. The present price of a cycle is Rs 8000. If its value is decreasing every year by 10% then find the price before 3 years.
14. 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.
15. If the population of a city has been increasing at the rate of 10%. The present population of the city is 9680000. Find its population 2 years ago.
16. Vidhya started a business with initial investment of 500000. She incurred a loss of 2% in the first year and in the second year she gained the profit of 10%. Calculate her net profit earned.
17. The production of spare parts rose to 25000 from 16000 in 2 years. Find the rate of growth per annum.
18. The annual rate of growth in population of a certain city is 10%. If its present population is 532400, find the population 3 years ago.
19. The present population of a village is 10000. If it increases at the rate of 2% per annum, find the population after 2 years.
20. 900 workers were employed to construct a dam in four years. At the end of first year, 5% workers were retrenched. At the end of the second year 2% of the workers were retrenched. To complete the construction in time, the number of workers were increased to 10% at the end of third year. How many workers were working at the end of fourth year.
21. 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.
22. Max bought a gadget for Rs. 21000. If the cost of the gadget after 2 years depreciates to Rs. 18162, find the rate of depreciation.
23. 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.

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