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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