Question

The simple interest on a sum of money is 25% of the principal and number of years is
equal to the rate percent per annum. Find the rate percent.
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Answer 1

let rate of interest be x

principal=no. of years=rate of interest=x

interest=25 percent of principal

=25x/100

x^3/100=25x/100 (as we know I=p*r*t/100)

=x^3=25x

=x^2=25

=x=5

Ans: Rate of interest is 5 percent