Compound Interest - One Line Questions

1. A sum of money doubles itself in 5 years at compound interest. In how many years will it become 8 times itself? — 15 years
2. A sum of money triples itself in 5 years at compound interest. In how many years will it become 27 times itself? — 15 years
3. What is the annual rate of interest if a principal of Rs. 10,000 amounts to Rs. 12,100 in 2 years, compounded annually? — 10%
4. 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: — 10%
5. 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? — 10%
6. A sum of money becomes Rs. 2100 in 2 years and Rs. 2310 in 3 years at compound interest. The rate of interest is: — 10%
7. 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%
8. A sum of money doubles in 4 years at compound interest. In how many years will it become 16 times itself? — 16 years
9. 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? — 20 years
10. 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: — 15.38%
11. A sum invested at compound interest amounts to Rs. 3840 in 1 year and Rs. 4608 in 2 years. The rate of interest is: — 20%
12. 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: — 25%
13. If a sum of money doubles in 7 years at compound interest, in how many years will it become 16 times itself? — 28 years
14. A sum becomes Rs. 4000 in 1 year and Rs. 5500 in 2 years at compound interest. The rate of interest is: — 37.5%
15. The compound interest on a sum for 2 years is Rs. 249 and the simple interest is Rs. 240. Find the rate of interest. — 5%
16. 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. — 10%
17. 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. — 5%
18. What is the formula for the amount (A) when interest is compounded annually? — A = P * (1 + R/100)^T
19. What is the formula for calculating the compound interest (CI) for a principal amount (P) invested at an annual interest rate (R) for a time period (T) in years, compounded annually? — CI = P * (1 + R/100)^T - P
20. 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? — Rate = R/2, Time = 2T
21. If the interest is compounded quarterly, the rate and time period are adjusted as: — Rate = R/4, Time = 4T
22. 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. — Rs. 12,000
23. If Rs. 8,000 is invested at 10% per annum compound interest, payable annually, what is the amount after 3 years? — Rs. 10,648
24. What is the principal amount if the compound interest is Rs. 252 for 2 years at 10% per annum? — Rs. 1200
25. What is the principal if the compound interest for 2 years is Rs. 210 and the simple interest for 2 years is Rs. 200? — Rs. 1000
26. 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. — Rs. 1000
27. If the compound interest on a sum for 2 years is Rs. 249 and the simple interest is Rs. 240, what is the principal? — Rs. 1200
28. 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. — Rs. 1000
29. If Rs. 10,000 is invested at an annual interest rate of 10% for 3 years, compounded annually, what is the amount after 3 years? — Rs. 13,310
30. What is the compound interest on Rs. 1000 for 1.5 years at 10% per annum, compounded semi-annually? — Rs. 152.50
31. Find the compound interest on Rs. 20,000 for 1 year at 8% per annum, compounded semi-annually. — Rs. 1640
32. 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? — Rs. 205
33. What is the principal amount if the compound interest is Rs. 410 for 2 years at 10% per annum, compounded annually? — Rs. 2000
34. What is the annual installment of a debt of Rs. 6600 due in 3 years at 10% compound interest? — Rs. 2200
35. Find the compound interest on Rs. 16,000 for 9 months at 20% per annum, compounded quarterly. — Rs. 2520
36. The difference between the compound interest and simple interest on Rs. 1200 for 2 years at 5% per annum is: — Rs. 6
37. The difference between the compound interest and simple interest on Rs. 1,500 for 2 years at 5% per annum is: — Rs. 3.75
38. 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? — Rs. 312.50
39. What is the compound interest on Rs. 2000 for 3 years at 5% per annum, compounded annually? — Rs. 307.50
40. What is the compound interest on Rs. 10000 for 3 years at 10% per annum, compounded annually? — Rs. 3310
41. The difference between the compound interest and simple interest on Rs. 5000 for 2 years at 4% per annum is: — Rs. 32
42. What is the annual installment of a debt of Rs. 13200 due in 3 years at 10% compound interest? — Rs. 4840
43. What is the compound interest on Rs. 5000 for 1 year at 10% per annum, compounded semi-annually? — Rs. 512.50
44. 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. — Rs. 5000
45. 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. — Rs. 8000
46. A sum of money becomes Rs. 7290 in 3 years at 10% compound interest. What was the principal amount? — Rs. 6000
47. Calculate the compound interest on Rs. 3,000 at 7% per annum for 3 years. — Rs. 661.50
48. 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? — Rs. 800
49. 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? — Rs. 8000
50. Calculate the compound interest on Rs. 5,000 at 8% per annum for 2 years. — Rs. 832
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