Question
If the simple interest on a certain sum of money is 9/25
of the sum and the rate percent equals the number years, then the rate of interest per annum is:Solution
Let the principal be Rs x. Then the SI = 9/25x Rate of interest = Time => r = (100 × 9/25x)/ (x × r) => r2 = 900/25 => r = 6%
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