The compound interest on a certain sum for 2 years at 10% per annum is Rs. 1260. Find the principal sum. MCQ with Answer and Explanation

The compound interest on a certain sum for 2 years at 10% per annum is Rs. 1260. Find the principal sum.
A. Rs. 6000
B. Rs. 7000
C. Rs. 6500
D. Rs. 5500
Answer: Option A
Solution (By JKSSB Mock Tests)
Effective rate of compound interest for 2 years at 10% = 10 + 10 + (1010)/100 = 21%. Given 21% of P = 1260 => P = 1260 / 0.21 = Rs. 6000.

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Practice More Compound Interest Questions

Question #1
The compound interest on a certain sum of money for 2 years at 8% per annum is Rs. 416. What would be the simple interest on the same sum at the same rate for the same time?
A. Rs. 400
B. Rs. 410
C. Rs. 380
D. Rs. 412

Correct Answer: Option A


Explanation:
Effective rate of compound interest for 2 years at 8% = 8 + 8 + (88)/100 = 16.64%. Simple interest rate = 8 * 2 = 16%. Given 16.64% of sum = 416 => 1% of sum = 25. Simple Interest = 16% of sum = 16 * 25 = Rs. 400.

This question belongs to: Maths Compound Interest
Question #2
The difference between simple interest and compound interest on a certain sum of money for 2 years at 8% per annum is Rs. 128. Find the sum.
A. Rs. 18000
B. Rs. 20000
C. Rs. 24000
D. Rs. 22000

Correct Answer: Option B


Explanation:
Difference for 2 years = P * (R/100)^2 => 128 = P * (8/100)^2 => 128 = P * (64 / 10000) => P = (128 * 10000) / 64 = Rs. 20000.

This question belongs to: Maths Compound Interest
Question #3
A sum of money placed at compound interest becomes double of itself in 4 years. In how many years will it become 8 times of itself?
A. 12 years
B. 16 years
C. 8 years
D. 20 years

Correct Answer: Option A


Explanation:
The sum becomes 2^1 times in 4 years. It will become 8 (2^3) times in 3 * 4 = 12 years.

This question belongs to: Maths Compound Interest