The difference between CI and SI on a certain sum for 2 years at 6% is Rs. 36. The sum is: MCQ with Answer and Explanation

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The difference between CI and SI on a certain sum for 2 years at 6% is Rs. 36. The sum is:

A. Rs. 10000

B. Rs. 8000

C. Rs. 11000

D. Rs. 9000

Answer: Option A

Solution (By JKSSB Mock Tests)

D = P × (0.06)² = P × 0.0036 = 36 ⇒ P = 10000.

This question belongs to: Maths Compound Interest

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Question #1

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A sum of money at compound interest becomes 9 times in 4 years. In how many years will it become 81 times?

A. 7 years

B. 10 years

C. 8 years

D. 6 years

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Correct Answer: Option C

Explanation:
81 = 9², so 4 × 2 = 8 years.

This question belongs to: Maths Compound Interest

Question #2

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At what rate of compound interest will Rs. 2000 amount to Rs. 2205 in 2 years?

A. 5%

B. 4%

C. 7%

D. 6%

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Correct Answer: Option A

Explanation:
2000(1+r)² = 2205 ⇒ (1+r)² = 1.1025 = (1.05)² ⇒ r = 5%.

This question belongs to: Maths Compound Interest

Question #3

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The compound interest on Rs. 9500 at 8% per annum for 2 years is:

A. Rs. 1595

B. Rs. 1588

C. Rs. 1580.80

D. Rs. 1576

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Correct Answer: Option C

Explanation:
A = 9500 × (1.08)² = 9500 × 1.1664 = 11080.80, CI = 11080.80 − 9500 = Rs. 1580.80.

This question belongs to: Maths Compound Interest

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