Compound Interest (Railway Maths) (Part – III)

Total Questions: 50

31. A sum of Rs. 400 would become Rs. 441 after 2 years at r% p.a. Compound interest. Find the value of r. [RRB NTPC 07/04/2021 (Morning) ]

Correct Answer: (b) 5%
Solution:

32. Find the sum for which the difference in the compound interest compounded annually and the simple interest for 3 years at 5% p.a. is Rs. 244. [RRB NTPC 08/04/2021 (Evening)]

Correct Answer: (a) Rs. 32,000
Solution:

33. Find the compound interest on Rs. 5,000 at a rate of 6% per annum for 3 years, compounded annually [correct to the nearest integer]. [RRB NTPC 23/07/2021 (Morning)]

Correct Answer: (a) Rs. 955
Solution:

34. The difference between simple interest and compound interest on Rs. 1,00,000 for 18 months at 12% annum reckoned half yearly is: [RRB NTPC 24/07/2021 (Evening)]

Correct Answer: (c) Rs. 1,101.6
Solution:

35. At what rate of compound interest per annum will a sum of Rs. 1,250 become Rs. 1,488.77 in 3 years? [RRB NTPC 26/07/2021 (Evening)]

Correct Answer: (d) 6%
Solution:

36. The least number of years in which a sum of money invested at 20% compound interest will become more than its double is : [RRB NTPC 31/07/2021 (Morning) ]

Correct Answer: (c) 4
Solution:

37. Find the Compound Interest on a sum of Rs.1000 at the rate of 10% per annum for 1.5 years when interest is compounded half-yearly. [RRB JE 22/05/2019 (Afternoon)]

Correct Answer: (d) Rs.157.63
Solution:

38. The difference between Compound Interest and Simple Interest on a certain sum for 2 years at 12.5% rate is Rs.45. What is the sum? [RRB JE 22/05/2019 (Afternoon)]

Correct Answer: (c) Rs. 2880
Solution:

39. On a certain sum of money, the Compound Interest for 2 years is Rs.309 and the Simple Interest is Rs.300. Find the rate of interest per annum. [RRB JE 22/05/2019 (Evening)]

Correct Answer: (a) 6%
Solution:

40. On what principal will the difference between Compound Interest and Simple Interest at 10% rate in 3 years be equal to Rs.620? [RRB JE 24/05/2019 (Evening)]

Correct Answer: (c) Rs. 20000
Solution: