Find the Rate Percent Per Annum :

The simple interest on a sum of money is 8/25 of the sum. If the number of years is numerically half the rate percent per annum, then the rate percent per annum is

  1. 5
  2. 4
  3. 8
  4. 25/4
Anurag Mishra Professor Asked on 26th October 2015 in Maths.
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  • 1 Answer(s)

    Answer is (3): 8

    Explanation:-
    Let the principal be Rs. X and rate = R%
    Then, the simple interest = 8 X/25 and time = R/2

    8 X/25  =X x R X R/100 x 2
    8/25 = R^2/2 x 100
    8 = R^2 / 2 x 4
    R^2 = 8 x 8 
    square root on both side,
    Then, R = 8 %

    Hence, the answer is (3) 8.

    Monis Rasool Professor Answered on 28th October 2015.
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