A sum of money at compound interest becomes 4 times in 3 years. In how many years will it become 16 times? MCQ with Answer and Explanation

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A sum of money at compound interest becomes 4 times in 3 years. In how many years will it become 16 times?

A. 4 years

B. 5 years

C. 6 years

D. 9 years

Answer: Option C

Solution (By JKSSB Mock Tests)

4² = 16, so 3 × 2 = 6 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 doubles in 15 years. In how many years will it become 128 times?

A. 90 years

B. 75 years

C. 120 years

D. 105 years

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Correct Answer: Option D

Explanation:
128 = 2⁷, so 15 × 7 = 105 years.

This question belongs to: Maths Compound Interest

Question #2

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The difference between CI and SI on Rs. 6800 for 2 years at 10% is:

A. Rs. 68

B. Rs. 60

C. Rs. 70

D. Rs. 65

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Correct Answer: Option A

Explanation:
D = 6800 × 0.01 = Rs. 68.

This question belongs to: Maths Compound Interest

Question #3

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The difference between CI and SI on Rs. 2300 for 2 years at 10% is:

A. Rs. 22

B. Rs. 21

C. Rs. 23

D. Rs. 24

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Correct Answer: Option C

Explanation:
D = 2300 × 0.01 = Rs. 23.

This question belongs to: Maths Compound Interest

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