This is aptitude questions and answers section on Compound Interest with explanation for various interview, competitive examinations and entrance tests.

1. Find the compound interest and the amount on Rs.8000 at 5% per annum for 3 years when C.I is reckoned yearly?
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2. If Rs.7500 are borrowed at C.I at the rate of 4% per annum, then after 2 years the amount to be paid is?
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3. Find out the C.I on Rs.5000 at 4% p.a. compound half-yearly for 1 1/2 years.
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Answer: Option C

Explanation:

A = 5000(51/50)^{3}

= 5306.04

5000

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306.04

4. Rs.8000 become Rs.9261 in a certain interval of time at the rate of 5% per annum of C.I. Find the time?
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Answer: Option D

Explanation:

9261 = 8000(21/20)^{N}

(21/20)^{3} = (21/20)^{N} =>
N = 3

5. At the end of three years what will be the compound interest at the rate of 10% p.a. on an amount of Rs.20000?
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Answer: Option A

Explanation:

A = 20000(11/10)^{3}

= 26620

= 20000

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6620