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. 12 years

B. 6 years

C. 8 years

D. 10 years

Answer: Option C

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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The compound interest on a sum for 2 years at 9% is Rs. 376.20. The sum is:

A. Rs. 2200

B. Rs. 2000

C. Rs. 2400

D. Rs. 1800

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Correct Answer: Option B

Explanation:
CI = P × 0.1881 = 376.20 ⇒ P = 2000.

This question belongs to: Maths Compound Interest

Question #2

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If the simple interest on a sum for 2 years at 8% is Rs. 400, the compound interest on the same sum for 2 years at 8% is:

A. Rs. 416

B. Rs. 440

C. Rs. 424

D. Rs. 432

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Correct Answer: Option A

Explanation:
P = SI × 100 / (8×2) = 40000/16 = 2500. CI = 2500[(1.08)² − 1] = 2500 × 0.1664 = Rs. 416.

This question belongs to: Maths Compound Interest

Question #3

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The difference between simple interest and compound interest on a certain sum of money for 3 years at 10% per annum is Rs. 620. Find the sum.

A. Rs. 24000

B. Rs. 20000

C. Rs. 22000

D. Rs. 18000

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Correct Answer: Option B

Explanation:
Difference for 3 years = P * (R/100)^2 * (3 + R/100) => 620 = P * (10/100)^2 * (3 + 10/100) => 620 = P * (1/100) * (3.1) => 620 = P * 0.031 => P = 620 / 0.031 = Rs. 20000.

This question belongs to: Maths Compound Interest

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