Simple Interest (Railway Maths) (Part – III)

Total Questions: 50

11. A certain sum of money at simple interest amounts to Rs. 1,512 in 3 years and to Rs. 1,668 in 4.5 years. The rate of interest on this sum of money is: [RRB NTPC 01/03/2021 (Morning) ]

Correct Answer: (a) 26/3%
Solution:

12. Find the answer of given question? [RRB NTPC 02/03/2021 (Morning) ]

Correct Answer: (b) 16%
Solution:

13. How long will it take a sum of money invested at 10% per annum at simple interest to increase its value by 40%? [RRB NTPC 02/03/2021 (Morning)]

Correct Answer: (c) 4 years
Solution:

14. If the simple interest for 8 years is equal to 40% of the principal amount, it will be equal to the principal amount at the same interest rate after: [RRB NTPC 02/03/2021 (Evening)]

Correct Answer: (d) 20 years
Solution:

15. A sum of Rs. 480 amounts to Rs. 600 in 5 years at simple interest. If the interest rate was 2% higher, by how much would the interest amount increase? [RRB NTPC 04/03/2021 (Morning)]

Correct Answer: (c) Rs. 48
Solution:

16. A invests two equal amounts in two banks giving rates of simple interest as 10% per annum and 12% per annum respectively. At the end of the year, the interest earned is Rs. 1,650. The amount invested in each bank is: [RRB NTPC 05/03/2021 (Morning)]

Correct Answer: (c) 7,500
Solution:

17. The ratio of simple interest earned on a certain amount at the rate of 5% and 8% for 6 years and 3 years respectively is: [RRB NTPC 07/03/2021 (Evening)]

Correct Answer: (a) 5 : 4
Solution:

18. A sum becomes its double in 8 years. The annual rate of simple interest is: [RRB NTPC 08/03/2021 (Evening) ]

Correct Answer: (d)
Solution:

19. Manvi borrowed some money on simple interest, at the rate of 6% p.a. for the first three years, at the rate of 9% p.a. for the next five years and the rate of 13% p.a. for the period beyond eight years. If the total interest paid by him at the end of eleven years is Rs. 8,160, how much money did he borrow? [RRB NTPC 11/03/2021 (Morning)]

Correct Answer: (b) Rs. 8,000
Solution:

20. The simple interest on a certain sum of money at the rate of 6% p.a. for 7 years is Rs. 840. At what rate of interest can the same amount of interest be received on the same sum of money after 5 years? [RRB NTPC 11/03/2021 (Evening)]

Correct Answer: (c) 8.4%
Solution: