In how many years, a sum will become four times itself

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In how many years, a sum will become four times itself at the rate of 12% per annum ?

Let the sum be ₹ P .
Then, SI = 4P - P = ₹ 3P
(P x 12 x T)/100 = 3P
⇒ T = (3 x 100)/12 = 25 yr