What will be the Rate % per Annum? If

On a certain, sum, the simple interest at the end of 12.5 years becomes 3/4 of the sum. What is the rate % per annum?

  1. 4%
  2. 5%
  3. 6%
  4. 8%
Desire Adnan Default Asked on 4th August 2015 in Maths,   Movies.
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1 Answer(s)

Answer: (3) 6 %
Explanation:-
Let the principal be P  & the rate is R %.
Then, Simple Interest = 3 P /4

Formula-
Simple Interest = P x R x T/100
Where, P = principal , R = rate, & T = time.

Time = 12.5 = 25 / 2 years                   (Given)

Then, 3 P /4 = P x 25 x R /100 x 2
3 / 4 = R / 4 x 2
3 = R / 2
R = 3 x 2
R = 6 %.

Hence, the rate percent per annum  is 6 %.

Anurag Mishra Professor Answered on 6th August 2015.
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