A sum of money invested at compound interest doubles itself in 13 years. In how many years will it become 4 times of itself? MCQ with Answer and Explanation

A sum of money invested at compound interest doubles itself in 13 years. In how many years will it become 4 times of itself?

A. 39 years

B. 19 years

C. 32 years

D. 26 years

Answer: Option D

The sum doubles (2^1) in 13 years. It will become 4 (2^2) times in 2 * 13 = 26 years.

This question belongs to: Maths Compound Interest

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Question #1 Report Error

The compound interest on Rs. 500 for 2 years at 4% per annum is:

A. Rs. 41.60

B. Rs. 40.80

C. Rs. 40.00

D. Rs. 42.40

Correct Answer: Option B

Explanation:
A = 500 × (1.04)² = 500 × 1.0816 = 540.80, CI = 540.80 − 500 = Rs. 40.80.

This question belongs to: Maths Compound Interest

Question #2 Report Error

Find the compound interest on Rs. 4500 at 8% per annum for 1 year compounded half-yearly.

A. Rs. 367.20

B. Rs. 374.40

C. Rs. 360

D. Rs. 380

Correct Answer: Option A

Explanation:
Half-yearly rate 4%, n=2. A = 4500 × (1.04)² = 4500 × 1.0816 = 4867.20, CI = 4867.20 − 4500 = Rs. 367.20.

This question belongs to: Maths Compound Interest

Question #3 Report Error

The difference between CI and SI for 3 years on Rs. 5000 at 10% is:

A. Rs. 150

B. Rs. 155

C. Rs. 165

D. Rs. 160

Correct Answer: Option B

Explanation:
D = 5000 × (0.1)² × (3 + 0.1) = 5000 × 0.01 × 3.1 = Rs. 155.

This question belongs to: Maths Compound Interest