A sum of money at compound interest becomes 5 times in 4 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 4 years. In how many years will it become 25 times?

A. 8 years

B. 12 years

C. 10 years

D. 6 years

Answer: Option A

Solution (By JKSSB Mock Tests)

25 = 5², so 4 × 2 = 8 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 amounts to Rs. 18150 in 2 years and Rs. 19965 in 3 years. Find the sum.

A. Rs. 16000

B. Rs. 15000

C. Rs. 17000

D. Rs. 14000

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Correct Answer: Option B

Explanation:
Rate = (19965/18150 − 1) × 100 = 10%. P = 18150 / 1.21 = 15000.

This question belongs to: Maths Compound Interest

Question #2

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Find the compound interest on Rs. 2500 at 12% per annum for 2 years.

A. Rs. 650

B. Rs. 640

C. Rs. 630

D. Rs. 636

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Correct Answer: Option D

Explanation:
A = 2500 × (1.12)² = 2500 × 1.2544 = 3136, CI = 3136 − 2500 = Rs. 636.

This question belongs to: Maths Compound Interest

Question #3

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In how many years will Rs. 4000 amount to Rs. 4410 at 5% per annum compound interest?

A. 1.5 years

B. 2 years

C. 2.5 years

D. 1 year

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Correct Answer: Option B

Explanation:
4000(1.05)^t = 4410 ⇒ (1.05)^t = 1.1025 ⇒ t = 2.

This question belongs to: Maths Compound Interest

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