Compound Interest (Railway Maths) (Part – III)

Total Questions: 50

11. At what annual rate of compound interest, compounded semi-annually, will Rs. 57,600 become Rs. 72,900 in one year? [RRB NTPC 03/03/2021 (Evening)]

Correct Answer: (d) 25% per annum
Solution:

12. A sum of money doubles itself at compound interest in 12 years. In how many years will it become 4 times ? [RRB NTPC 04/03/2021 (Morning) ]

Correct Answer: (d) 24
Solution:

13. Find the compound interest on Rs. 20,000/- in 2 years at 8% per annum, if interest is compounded yearly. [RRB NTPC 04/03/2021 (Evening)]

Correct Answer: (a) Rs. 3,328.00
Solution:

14. What is the principal amount which earns Rs. 154/- as a compound interest for the second year at 10% per annum? [RRB NTPC 04/03/2021 (Evening)]

Correct Answer: (d) Rs. 1,400.00
Solution:

15. The compound interest on Rs. 20,000 in 2 years at 4% per year, the interest being compounded half-yearly, will be: [RRB NTPC 08/03/2021 (Morning)]

Correct Answer: (a) Rs. 1648.64
Solution:

16. The difference between the compound interest and the simple interest on a certain amount at a rate of interest of 5% per annum for 2 years is Rs. 25. Find the amount. [RRB NTPC 08/03/2021 (Morning)]

Correct Answer: (a) Rs. 10000
Solution:

17. In how many years will a sum of Rs. 4,000 be increased to Re. 4,840 at 10% compound interest per annum? [RRB NTPC 08/03/2021 (Morning)]

Correct Answer: (a) 2
Solution:

18. Ramu borrows Rs. 64,000 at 25% per annum compound interest. At the end of every year he pays Rs. 3,200 as part of repayment. How much does he still owe after 3 such instalments? [RRB NTPC 08/03/2021 (Evening)]

Correct Answer: (a) Rs. 1,12,800
Solution:

19. Mahesh invested an amount of Rs. 8000 in a fixed deposit scheme for 2 years at compound interest 5 p.c.p.a. How much amount will Mahesh get on maturity of the fixed deposit? [RRB NTPC 11/03/2021 (Morning)]

Correct Answer: (b) Rs. 8,820
Solution:

20. A man borrows Rs. 2,460 to be paid back with compound interest at the rate of 5% p.a. By the end of 2 years, in equal installments. How much will each installment be? [RRB NTPC 11/03/2021 (Evening)]

Correct Answer: (d) Rs. 1,323
Solution: