A sum of money at compound interest becomes 6 times in 3 years. In how many years will it become 36 times? MCQ with Answer and Explanation

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A sum of money at compound interest becomes 6 times in 3 years. In how many years will it become 36 times?

A. 9 years

B. 5 years

C. 4 years

D. 6 years

Answer: Option D

Solution (By JKSSB Mock Tests)

36 = 6², so 3 × 2 = 6 years.

This question belongs to: Maths Compound Interest

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Question #1

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The compound interest on a sum for 2 years at 5% is Rs. 102.50. Find the sum.

A. Rs. 1050

B. Rs. 950

C. Rs. 1000

D. Rs. 1100

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Correct Answer: Option C

Explanation:
CI = P × 0.1025 = 102.50 ⇒ P = 1000.

This question belongs to: Maths Compound Interest

Question #2

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In how many years will Rs. 2000 amount to Rs. 2205 at 5% per annum compound interest?

A. 2.5 years

B. 2 years

C. 1.5 years

D. 3 years

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Correct Answer: Option B

Explanation:
2000(1.05)^t = 2205 ⇒ (1.05)^t = 1.1025 = (1.05)² ⇒ t = 2.

This question belongs to: Maths Compound Interest

Question #3

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The compound interest on a sum for 1 year at 8% compounded half-yearly is Rs. 408. The sum is:

A. Rs. 4800

B. Rs. 5200

C. Rs. 5400

D. Rs. 5000

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Correct Answer: Option D

Explanation:
A = P(1.04)² = P × 1.0816. CI = P × 0.0816 = 408 ⇒ P = 408 / 0.0816 = 5000.

This question belongs to: Maths Compound Interest

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