A sum of money at compound interest becomes 5 times in 5 years. In how many years will it become 125 times? MCQ with Answer and Explanation

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A sum of money at compound interest becomes 5 times in 5 years. In how many years will it become 125 times?

A. 20 years

B. 15 years

C. 10 years

D. 12 years

Answer: Option B

Solution (By JKSSB Mock Tests)

125 = 5³, so 5 × 3 = 15 years.

This question belongs to: Maths Compound Interest

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Question #1

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Find the compound interest on Rs. 17500 at 8% per annum for 2 years.

A. Rs. 2940

B. Rs. 3000

C. Rs. 2968

D. Rs. 2912

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Correct Answer: Option D

Explanation:
A = 17500 × 1.1664 = 20412, CI = 20412 − 17500 = Rs. 2912.

This question belongs to: Maths Compound Interest

Question #2

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The difference between simple interest and compound interest on a certain sum of money for 3 years at 10% per annum is Rs. 124. Find the sum.

A. Rs. 4500

B. Rs. 3500

C. Rs. 5000

D. Rs. 4000

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Correct Answer: Option D

Explanation:
Difference for 3 years = P * (R/100)^2 * (3 + R/100) => 124 = P * (10/100)^2 * (3 + 10/100) => 124 = P * (1/100) * (3.1) => 124 = P * 0.031 => P = 124 / 0.031 = Rs. 4000.

This question belongs to: Maths Compound Interest

Question #3

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The compound interest on Rs. 10500 at 10% per annum for 2 years is:

A. Rs. 2100

B. Rs. 2310

C. Rs. 2420

D. Rs. 2205

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Correct Answer: Option D

Explanation:
A = 10500 × 1.21 = 12705, CI = 12705 − 10500 = Rs. 2205.

This question belongs to: Maths Compound Interest

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