A sum of money at compound interest becomes 5 times in 3 years. In how many years will it become 25 times? MCQ with Answer and Explanation

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A sum of money at compound interest becomes 5 times in 3 years. In how many years will it become 25 times?

A. 6 years

B. 5 years

C. 4 years

D. 9 years

Answer: Option A

Solution (By JKSSB Mock Tests)

5 times in 3 years; 25 = 5², so 3 × 2 = 6 years.

This question belongs to: Maths Compound Interest

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Question #1

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A sum of money becomes 2 times in 4 years at compound interest. In how many years will it become 8 times?

A. 16 years

B. 10 years

C. 8 years

D. 12 years

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Correct Answer: Option D

Explanation:
2 times in 4 years; 8 = 2³, so 4 × 3 = 12 years.

This question belongs to: Maths Compound Interest

Question #2

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In how many years will Rs. 2500 amount to Rs. 3025 at 10% per annum compound interest?

A. 1.5 years

B. 2.5 years

C. 2 years

D. 3 years

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Correct Answer: Option C

Explanation:
2500(1.1)^t = 3025 ⇒ (1.1)^t = 1.21 = (1.1)² ⇒ t = 2.

This question belongs to: Maths Compound Interest

Question #3

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In how many years will Rs. 5000 become Rs. 5618 at 6% compound interest?

A. 2.5 years

B. 3 years

C. 1.5 years

D. 2 years

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Correct Answer: Option D

Explanation:
5000(1.06)^t = 5618 ⇒ (1.06)^t = 1.1236 = (1.06)² ⇒ t = 2.

This question belongs to: Maths Compound Interest

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