With 12.50% simple interest rate how many years are needed for a principal to get double ?

With 12.50% simple interest rate how many years are needed for a principal to get double ? Correct Answer 8

Principal with simple interest, A = P(1 + n r) or,  2P = P(1 + n x 12.5/100) or,  2P/P = 1 + n x 12.5/100  or,  n x 12.5/100 = 2 - 1 or,  n x 12.5/100 = 1 or,  n = 1 x 100 / 12.5 =  8 years
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