At what rate percent compound interest will a sum of money become 9 times in 2 years? MCQ with Answer and Explanation

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At what rate percent compound interest will a sum of money become 9 times in 2 years?

A. 250%

B. 100%

C. 150%

D. 200%

Answer: Option D

Solution (By JKSSB Mock Tests)

(1 + r)² = 9 ⇒ 1 + r = 3 ⇒ r = 2 = 200%.

This question belongs to: Maths Compound Interest

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Practice More Compound Interest Questions

Question #1

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

A. Rs. 640

B. Rs. 630

C. Rs. 636

D. Rs. 650

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Correct Answer: Option C

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

This question belongs to: Maths Compound Interest

Question #2

Find the compound interest on Rs. 9000 at 8% per annum for 2 years.

A. Rs. 1497.60

B. Rs. 1500

C. Rs. 1512

D. Rs. 1524.80

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Correct Answer: Option A

Explanation:
A = 9000 × (1.08)² = 9000 × 1.1664 = 10497.60, CI = 10497.60 − 9000 = Rs. 1497.60.

This question belongs to: Maths Compound Interest

Question #3

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. 28 years

B. 42 years

C. 35 years

D. 21 years

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Correct Answer: Option A

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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