A sum of money at compound interest becomes 3 times in 6 years. In how many years will it become 27 times? MCQ with Answer and Explanation

A sum of money at compound interest becomes 3 times in 6 years. In how many years will it become 27 times?
A. 12 years
B. 15 years
C. 24 years
D. 18 years
Answer: Option D
Solution (By JKSSB Mock Tests)
3³ = 27, so 6 × 3 = 18 years.

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Practice More Compound Interest Questions

Question #1
The compound interest on a certain sum of money for 2 years at 5% per annum is Rs. 164. What would be the simple interest on the same sum at the same rate for the same time?
A. Rs. 155
B. Rs. 160
C. Rs. 162
D. Rs. 163

Correct Answer: Option B


Explanation:
Effective rate of compound interest for 2 years at 5% = 5 + 5 + (55)/100 = 10.25%. Simple interest rate = 5 * 2 = 10%. Given 10.25% of sum = 164 => 1% of sum = 16. Simple Interest = 10% of sum = 10 * 16 = Rs. 160.

This question belongs to: Maths Compound Interest
Question #2
The compound interest on a certain sum of money for 2 years at 6% per annum is Rs. 370.80. What would be the simple interest on the same sum at the same rate for the same time?
A. Rs. 365
B. Rs. 370
C. Rs. 360
D. Rs. 350

Correct Answer: Option C


Explanation:
Effective rate of compound interest for 2 years at 6% = 6 + 6 + (66)/100 = 12.36%. Simple interest rate = 6 * 2 = 12%. Given 12.36% of sum = 370.80 => 1% of sum = 30. Simple Interest = 12% of sum = 12 * 30 = Rs. 360.

This question belongs to: Maths Compound Interest
Question #3
Find the compound interest on Rs. 12000 at 8% per annum for 1 year compounded half-yearly.
A. Rs. 979.20
B. Rs. 988.80
C. Rs. 960
D. Rs. 998.40

Correct Answer: Option A


Explanation:
Half-yearly rate 4%, n=2. A = 12000 × (1.04)² = 12000 × 1.0816 = 12979.20, CI = 12979.20 − 12000 = Rs. 979.20.

This question belongs to: Maths Compound Interest