[2 years] Simple interest on a sum at 4% per annum for 2 years is Rs.80.The compound interest on the same sum

For Competitive Exams

Simple interest on a sum at 4% per annum for 2 years is Rs.80.The compound interest on the same sum for the same period is:

2 years

3 years

4 years

Rs.81.60

Explanation:

Let time be t years
882=800(1+5100)t=882800=(2120)t882=800(1+5100)t=882800=(2120)t
= (2120)2=(2120)t⇒t=2(2120)2=(2120)t⇒t=2
time = 2 years

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