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. 12 years

B. 10 years

C. 15 years

D. 20 years

Answer: Option C

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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The difference between simple interest and compound interest on a certain sum of money for 2 years at 4% per annum is Rs. 64. Find the sum.

A. Rs. 40000

B. Rs. 44000

C. Rs. 48000

D. Rs. 36000

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Correct Answer: Option A

Explanation:
Difference for 2 years = P * (R/100)^2 => 64 = P * (4/100)^2 => 64 = P * (16 / 10000) => P = (64 * 10000) / 16 = Rs. 40000.

This question belongs to: Maths Compound Interest

Question #2

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A sum of money at compound interest amounts to thrice itself in 3 years. In how many years will it be 9 times itself?

A. 6 years

B. 9 years

C. 12 years

D. 8 years

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Correct Answer: Option A

Explanation:
The sum becomes 3 times in 3 years. It will become 3^2 = 9 times in 2 * 3 = 6 years.

This question belongs to: Maths Compound Interest

Question #3

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The difference between CI and SI on Rs. 9600 for 2 years at 5% is:

A. Rs. 26

B. Rs. 22

C. Rs. 24

D. Rs. 20

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Correct Answer: Option C

Explanation:
D = 9600 × 0.0025 = Rs. 24.

This question belongs to: Maths Compound Interest

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