Simple Interest, Compound Interest, Time and Work - One Line Questions

1. A works twice as fast as B. If A can complete a work in 30 days, then A and B together can complete the same work in: — 20 days
2. A can do a work in 18 days and B can do it in 12 days. They work together for 6 days. The remaining work is done by B. In how many total days is the work completed? — 11 days
3. A and B can complete a work in 12 days and 15 days respectively. They work together for 5 days. The remaining work is done by B. In how many total days is the work completed? — 13 days
4. A and B can complete a work in 15 days and 20 days respectively. They work together for 5 days. The remaining work is done by A. In how many total days is the work completed? — 12 days
5. A sum of money invested at compound interest amounts to Rs. 9600 in 3 years and Rs. 10648 in 4 years. What is the rate of interest? — 10%
6. A sum of money doubles in 5 years at simple interest. What is the rate of interest? — 20%
7. A man can complete a work in 50 days. He works for 10 days and then B alone finishes the remaining work in 60 days. In how many days can B alone do the work? — 120 days
8. A and B can complete a work in 72 days. A and B together finish 3/5 of the work in 24 days. B alone can finish the work in how many days? — 120 days
9. The population of a town increases by 5% every year. If the population is 100000 today, what will be its population after 2 years? — 110250
10. If a sum of money at simple interest doubles in 6 years, in how many years will it become 4 times itself? — 12 years
11. A sum of money doubles itself in 8 years at simple interest. In how many years will it triple itself? — 16 years
12. A can do a work in 20 days and B can do the same work in 30 days. They work together for 5 days. The remaining work is done by A alone. In how many total days will the work be completed? — 25 days
13. A sum of money triples itself in 10 years at simple interest. In how many years will it become 5 times itself? — 20 years
14. The compound interest on a sum of money for 2 years is Rs. 41 and the simple interest for the same period is Rs. 40. The rate of interest is: — 5%
15. A and B can complete a work in 30 days and 50 days respectively. They start working together, but A leaves after 10 days. In how many days will B complete the remaining work? — 30 days
16. A can do a work in 20 days and B can do it in 25 days. They work together for 10 days. Then C joins them and the remaining work is completed in 5 days. In how many days can C alone do the work? — 30 days
17. A sum of money triples itself in 12 years at simple interest. In how many years will it become 5 times itself? — 20 years
18. If a sum of money at simple interest doubles in 10 years, in how many years will it become 7 times itself? — 30 years
19. A and B can do a piece of work in 6 days and 8 days respectively. They begin to work together but A leaves after 3 days. In how many days will B finish the work? — 5 days
20. A sum of money becomes Rs. 8000 in 3 years and Rs. 27000 in 6 years at compound interest. The rate of interest is: — 50%
21. A and B can complete a work in 10 days and 12 days respectively. They start working together, but B leaves after 5 days. In how many days will A complete the remaining work? — 6 days
22. A and B can complete a work in 8 days and 12 days respectively. They start working together. After 3 days, A leaves. In how many more days will B complete the remaining work? — 6 days
23. A can do a piece of work in 10 days. B can do it in 15 days. C can do it in 20 days. They work together for 4 days. The remaining work is done by A. In how many total days is the work completed? — 7 days
24. If a sum of money doubles itself in 10 years at simple interest, what is the rate of interest per annum? — 10%
25. If the simple interest on a sum of money is 1/4 of the principal and the number of years is equal to the rate of interest, what is the rate of interest? — 5%
26. A sum of money becomes Rs. 13230 in 3 years and Rs. 14560 in 4 years at compound interest. The rate of interest is: — 10%
27. A sum of money lent at simple interest amounts to Rs. 720 in 2 years and to Rs. 1020 in a further period of 5 years. The rate of interest per annum is: — 10%
28. A sum of money becomes Rs. 1210 in 2 years and Rs. 1331 in 3 years at compound interest. The rate of interest is: — 10%
29. If the simple interest on a sum of money for 2 years is Rs. 200 and the compound interest for the same period is Rs. 210, what is the rate of interest? — 10%
30. A sum of money invested at compound interest amounts to Rs. 16500 in 1 year and Rs. 18150 in 2 years. The rate of interest is: — 10%
31. A and B can complete a piece of work in 10 days and 15 days respectively. In how many days can they together complete the work? — 6 days
32. P and Q can complete a work in 12 days and 18 days respectively. They start working together, but Q leaves after 4 days. In how many more days will P complete the remaining work? — 8 days
33. A can do a work in 15 days. B can do it in 20 days. They work together for 4 days. The remaining work is done by A. In how many days in total is the work completed? — 9 days
34. A sum of money is invested at compound interest. It doubles in 4 years. In how many years will it become 8 times itself? — 12 years
35. If Rs. 800 becomes Rs. 950 in 2 years at simple interest, what is the rate of interest? — 9.375%
36. A sum of money at simple interest becomes Rs. 1500 in 5 years and Rs. 1750 in 10 years. The sum is: — Rs. 1250
37. If the compound interest on a certain sum for 3 years at 10% per annum is Rs. 331, what is the sum? — Rs. 1000
38. If the interest is compounded annually, the difference between the compound interest and simple interest on a sum of money for 3 years at 10% per annum is Rs. 31. The sum is: — Rs. 1000
39. What is the difference between the compound interest on Rs. 5000 for 2 years at 5% per annum and the simple interest for the same period? — Rs. 12.50
40. A sum of Rs. 1000 is lent at 10% per annum compound interest. If the interest is compounded annually, what is the amount after 3 years? — Rs. 1331
41. A sum of money at simple interest amounts to Rs. 2160 in 3 years and Rs. 2480 in 4 years. The sum is: — Rs. 1800
42. What is the compound interest on Rs. 10000 for 3 years at 5% per annum, compounded annually? — Rs. 1575.25
43. The compound interest on a sum for 2 years at 12% per annum is Rs. 508.32. The sum is: — Rs. 2000
44. What is the compound interest on Rs. 5000 for 2 years at 4% per annum, compounded annually? — Rs. 408
45. What is the simple interest on Rs. 5000 for 3 years at 4% per annum? — Rs. 600
46. The difference between the compound interest and simple interest on a certain sum for 2 years at 10% per annum is Rs. 100. What is the sum? — Rs. 10000
47. A sum of money invested at compound interest amounts to Rs. 8000 in 3 years and Rs. 12000 in 4 years. The sum is: — Rs. 5333.33
48. A sum of money becomes Rs. 6600 in 3 years and Rs. 7200 in 4 years at simple interest. The sum is: — Rs. 5400
49. What is the difference between the compound interest and simple interest on Rs. 10000 for 2 years at 8% per annum? — Rs. 64
50. The difference between the compound interest and simple interest on a certain sum for 2 years at 15% per annum is Rs. 180. What is the sum? — Rs. 8000
All One Line Questions
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