A sum of money becomes four times of itself in 12 years. Find the rate percent per annum.
Let the sum = Rs. 100 then amount = Rs. 400 then S.I = Rs. 300 = PRT/100 or rate of interest(R) = 300 ×100 /(P×T) = 300 × 100 / ( 100 × 12) = 25%
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