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Question

If Rs 4000 amounts to Rs 5000 in 2 years, find the rate of simple interest per annum.

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Solution

let the rate of simple interest per annum be r%.Then for principalP, the amount after time t years isAmount=P+P×r×t100using; Amount=5000, P=4000,and t=2; as given in the question5000=4000+4000×r×21004000×r×2100=100080r=1000r=12.5Therefore, the rate of simple interest is 12.5%

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