A sum of money at compound interest doubles in 9 years. In how many years will it become 4 times? MCQ with Answer and Explanation

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A sum of money at compound interest doubles in 9 years. In how many years will it become 4 times?

A. 18 years

B. 21 years

C. 12 years

D. 15 years

Answer: Option A

Solution (By JKSSB Mock Tests)

4 = 2², so 9 × 2 = 18 years.

This question belongs to: Maths Compound Interest

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Question #1

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The compound interest on Rs. 12000 at 5% per annum for 2 years is:

A. Rs. 1290

B. Rs. 1200

C. Rs. 1230

D. Rs. 1260

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Correct Answer: Option C

Explanation:
A = 12000 × (1.05)² = 12000 × 1.1025 = 13230, CI = 13230 − 12000 = Rs. 1230.

This question belongs to: Maths Compound Interest

Question #2

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The difference between simple interest and compound interest on a certain sum of money for 3 years at 5% per annum is Rs. 61. Find the sum.

A. Rs. 8000

B. Rs. 9000

C. Rs. 8500

D. Rs. 7500

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Correct Answer: Option A

Explanation:
Difference for 3 years = P * (R/100)^2 * (3 + R/100) => 61 = P * (5/100)^2 * (3 + 5/100) => 61 = P * (1/400) * (3.05) => P = (61 * 400) / 3.05 = 24400 / 3.05 = Rs. 8000.

This question belongs to: Maths Compound Interest

Question #3

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The compound interest on Rs. 5900 at 10% per annum for 2 years is:

A. Rs. 1239

B. Rs. 1298

C. Rs. 1180

D. Rs. 1357

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Correct Answer: Option A

Explanation:
A = 5900 × 1.21 = 7139, CI = 7139 − 5900 = Rs. 1239.

This question belongs to: Maths Compound Interest

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