If the compound interest on a certain sum of money for 6 years at 10% per annum be Rs. 993, what would be the simple interest?  Choose the correct answer
A) Rs. 880  B) Rs. 890  C) Rs. 1800  D) Rs. 900  E) None
Let P = Principal   A - Amount   We have a = P(1 + R/100)3 and Rs. 1800I = A - P   ATQ 993 = P(1 + R/100)3 - P   ? P = 3000/-   Now SI @ 10% on 3000/- for 6 yrs = (3000 x 10 x 6)/100   = 1800/-   Answer: Rs. 1800.
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If the compound interest on a certain sum of money for 6 years at 10% per annum be Rs. 993, what would be the simple interest?