Compound Interest - Question Bank
1. The difference between the compound interest and simple interest on Rs. 1200 for 2 years at 5% per annum is:
2. A sum of money becomes Rs. 9261 in 3 years at compound interest. If the rate of interest is 5% per annum, what is the principal amount?
3. If the compound interest on a sum for 2 years is Rs. 410 and the simple interest on the same sum for 2 years at the same rate is Rs. 400, find the rate of interest.
4. A sum of money invested at compound interest amounts to Rs. 2400 in 1 year and Rs. 2900 in 2 years. The rate of interest is:
5. What is the compound interest on Rs. 2000 for 3 years at 5% per annum, compounded annually?
6. A sum of money becomes Rs. 10,000 in 2 years and Rs. 12,000 in 3 years at compound interest. The principal is:
7. If the simple interest on a sum for 3 years is Rs. 750 and the compound interest for 2 years is Rs. 525, find the rate of interest.
8. What is the annual installment of a debt of Rs. 6600 due in 3 years at 10% compound interest?
9. A sum of money invested at compound interest amounts to Rs. 1650 in 1 year and Rs. 1815 in 2 years. The rate of interest is:
10. The difference between the CI and SI on a sum of money for 3 years at 10% per annum is Rs. 31. Find the sum.
11. What is the compound interest on Rs. 5000 for 1 year at 10% per annum, compounded semi-annually?
12. A sum of money triples itself in 5 years at compound interest. In how many years will it become 27 times itself?
13. If the compound interest on a sum for 2 years is Rs. 249 and the simple interest is Rs. 240, what is the principal?
14. A sum of money becomes Rs. 2100 in 2 years and Rs. 2310 in 3 years at compound interest. The rate of interest is:
15. What is the compound interest on Rs. 10000 for 3 years at 10% per annum, compounded annually?
16. A sum invested at compound interest amounts to Rs. 3840 in 1 year and Rs. 4608 in 2 years. The rate of interest is:
17. The difference between the compound interest and simple interest on Rs. 5000 for 2 years at 4% per annum is:
18. A sum of money doubles in 4 years at compound interest. In how many years will it become 16 times itself?
19. What is the principal amount if the compound interest is Rs. 410 for 2 years at 10% per annum, compounded annually?
20. A sum becomes Rs. 4000 in 1 year and Rs. 5500 in 2 years at compound interest. The rate of interest is:
21. If the compound interest on a sum for 2 years at 5% is Rs. 325, what is the simple interest on the same sum for 2 years at the same rate?
22. What is the compound interest on Rs. 1000 for 1.5 years at 10% per annum, compounded semi-annually?
23. A sum of money becomes Rs. 1000 in 2 years and Rs. 1200 in 3 years at compound interest. The sum is:
24. If the amount after 2 years is Rs. 14,400 and after 3 years is Rs. 17,280, find the principal at 20% compound interest.
25. What is the annual installment of a debt of Rs. 13200 due in 3 years at 10% compound interest?
26. A sum of money becomes Rs. 7290 in 3 years at 10% compound interest. What was the principal amount?
27. The difference between the CI and SI on a sum of money for 2 years at 15% per annum is Rs. 135. Find the sum.
28. Find the compound interest on Rs. 16,000 for 9 months at 20% per annum, compounded quarterly.
29. If a sum of money doubles in 7 years at compound interest, in how many years will it become 16 times itself?
30. The compound interest on a sum of money at a certain rate for 2 years is Rs. 50.50 and the simple interest on the same sum for 2 years at the same rate is Rs. 50. Find the principal amount.
31. A sum of money grows to Rs. 13,310 in 3 years at a certain rate of compound interest. If the principal was Rs. 10,000, what is the rate of interest?
32. What is the principal if the compound interest for 2 years is Rs. 210 and the simple interest for 2 years is Rs. 200?
33. A sum of money doubles in 10 years at compound interest. How many years will it take for the sum to become 4 times itself?
34. Calculate the compound interest on Rs. 3,000 at 7% per annum for 3 years.
35. If the interest is compounded quarterly, the rate and time period are adjusted as:
36. A sum of money at compound interest becomes Rs. 10,890 in 2 years and Rs. 11,979 in 3 years. The rate of interest is:
37. The difference between the compound interest and simple interest on Rs. 1,500 for 2 years at 5% per annum is:
38. What is the annual rate of interest if a principal of Rs. 10,000 amounts to Rs. 12,100 in 2 years, compounded annually?
39. If Rs. 8,000 is invested at 10% per annum compound interest, payable annually, what is the amount after 3 years?
40. A sum of money invested at compound interest amounts to Rs. 650 in 1 year and Rs. 750 in 2 years. The rate of interest per annum is:
41. The compound interest on a sum for 2 years is Rs. 249 and the simple interest is Rs. 240. Find the rate of interest.
42. What is the principal amount if the compound interest is Rs. 252 for 2 years at 10% per annum?
43. A sum of money becomes Rs. 961 in 2 years at compound interest. If the rate of interest is 10% per annum, what is the principal amount?
44. If the simple interest on a sum for 2 years at 5% per annum is Rs. 200, what is the compound interest on the same sum for 2 years at the same rate?
45. Find the compound interest on Rs. 20,000 for 1 year at 8% per annum, compounded semi-annually.
46. What is the formula for the amount (A) when interest is compounded annually?
47. The difference between the compound interest and the simple interest on a certain sum for 3 years at a certain rate is Rs. 155. If the rate is 10% per annum, find the sum.
48. A sum of money doubles itself in 5 years at compound interest. In how many years will it become 8 times itself?
49. In compound interest, if the interest is compounded half-yearly, what is the rate and time period used in the formula A = P(1 + r/100)^n?
50. Calculate the compound interest on Rs. 5,000 at 8% per annum for 2 years.