Question
A man invested a certain amount of sum at 12.5% per
annum simple interest and earned an interest of Rs.2100 after 3 years. If the same amount is invested at 20% per annum compound interest, compounded annually for two years, then find the interest.Solution
Let the certain sum of money be Rs.P. So,  P x 0.125 x 3 = 2100 => P = Rs.5600 Desired interest = [(1.2)2 – 1] x 5600 = Rs.2464
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