Find the 10 Times of Rate of Interest.

A sum of money becomes 9 times in 20 years. Find the 10 times of rate of interest.

  1. 350%
  2. 45%
  3. 400%
  4. 250%
vijay Professor Asked on 2nd August 2015 in Maths.
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1 Answer(s)

Answer: (2) 45 %
Explanation:-
Given-
Time = 20 years,  Let the principal be X  &   Rate = R %
Then,  Amount = 9 X
Simple Interest = 9 X – 8 X
Formula-
Simple Interest = P x R x T/100
Where, P = principal , R = rate, & T = time.
Then,  8 X = X x 20 x R/100
8  = R/5
R = 40 %
If amount is 10 times .
Then, Simple Interest = 10 X – X = 9 X
9 X = X x 20  x R/100
9   =  R/5
R = 45 %
Hence, the answer is (2) 45 %.

Anurag Mishra Professor Answered on 2nd August 2015.
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