A sum of money placed at compound interest triples itself in 5 years. In how many years will it become 9 times of itself? MCQ with Answer and Explanation

Question

A sum of money placed at compound interest triples itself in 5 years. In how many years will it become 9 times of itself?

A. 12 years

B. 15 years

C. 8 years

D. 10 years

Answer: Option D

Solution (By JKSSB Mock Tests)

The sum becomes 3^1 times in 5 years. It will become 9 (3^2) times in 2 * 5 = 10 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 becomes 4 times in 3 years. In how many years will it become 16 times?

A. 4 years

B. 6 years

C. 9 years

D. 5 years

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Correct Answer: Option B

Explanation:
4² = 16, so 3 × 2 = 6 years.

This question belongs to: Maths Compound Interest

Question #2

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The present population of a town is 44100. If it increases at 5% per annum, what was the population 2 years ago?

A. 40000

B. 42000

C. 43000

D. 41000

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Correct Answer: Option A

Explanation:
Population 2 years ago = 44100 / (1.05)² = 44100 / 1.1025 = 40000.

This question belongs to: Maths Compound Interest

Question #3

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What sum will amount to Rs. 9261 in 2 years at 5% per annum compound interest?

A. Rs. 8400

B. Rs. 8600

C. Rs. 8200

D. Rs. 8000

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Correct Answer: Option A

Explanation:
P = 9261 / 1.1025 = 8400.

This question belongs to: Maths Compound Interest

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