Find the rate of interest per annum, if the simple interest on a certain sum of money is 4/25th of the sum and the rate percent equals the number of years
Let the principal be Rs. x, then the simple interest (I) = (4/25)x.
Let the rate of interest per annum be r% then time (T) = r years
R = 100 x I /P x T
r = 100 x (4/25) x / x x r
r2 = 400/25 or r = 20/5 = 4%
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