A sum of money invested at compound interest doubles itself in 10 years. In how many years will it become 4 times of itself? MCQ with Answer and Explanation

Question

A sum of money invested at compound interest doubles itself in 10 years. In how many years will it become 4 times of itself?

A. 25 years

B. 15 years

C. 20 years

D. 30 years

Answer: Option C

Solution (By JKSSB Mock Tests)

The sum doubles (2^1) in 10 years. It will become 4 (2^2) times in 2 * 10 = 20 years.

This question belongs to: Maths Compound Interest

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Question #1

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A sum of money at compound interest triples in 7 years. In how many years will it become 27 times?

A. 28 years

B. 14 years

C. 18 years

D. 21 years

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Correct Answer: Option D

Explanation:
27 = 3³, so 7 × 3 = 21 years.

This question belongs to: Maths Compound Interest

Question #2

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What sum will amount to Rs. 10816 in 2 years at 4% compound interest?

A. Rs. 10200

B. Rs. 9800

C. Rs. 10000

D. Rs. 10400

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Correct Answer: Option C

Explanation:
P = 10816 / (1.04)² = 10816 / 1.0816 = 10000.

This question belongs to: Maths Compound Interest

Question #3

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A sum of money invested at compound interest doubles itself in 14 years. In how many years will it become 4 times of itself?

A. 42 years

B. 28 years

C. 21 years

D. 35 years

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Correct Answer: Option B

Explanation:
The sum doubles (2^1) in 14 years. It will become 4 (2^2) times in 2 * 14 = 28 years.

This question belongs to: Maths Compound Interest

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