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 Problem: If the compound interest on a certain sum for 3 years at 10 % per annum be Rs 331, what would be the simple interest ? [ Calculator, Method and examples ]Solution:Your problem -> If the compound interest on a certain sum for 3 years at 10 % per annum be Rs 331, what would be the simple interest ?Here R = 10 %, N = 3 years, CI = 331CI = P (1 + R/100)^N - P= P ( 1 + 10 / 100 ) ^ 3 - P= P ( 110 / 100 ) ^ 3 - P= P (( 110 / 100 ) ^ 3 - 1)= 0.331 PNow CI = 331=> 0.331 P = 331=> P = 1000Now, SI = (P*R*N)/100 = (1000 * 10 * 3) / 100 = 300.

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