In how many years,

In how many years, a sum will be thrice of it at the rate of 10% per annum?

  1. 15 years
  2. 20 years
  3. 30 years
  4. 25 years
kaushar Default Asked on 30th July 2015 in Maths.
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1 Answer(s)

Answer: (2) 20 years
Explanation:-
Given-
R = 10 % , S I = 3 P – P = 2 P   & T = ?
Formula-
Simple Interest = P x R x T/100
where, P – principal,  R – rate, T – time  S I = Simple Interest

Then,
2 P = P x 10 x T/100
2 = T/10
T = 2 x 10
T = 20 years

Hence, In 20  years, a sum will be thrice of it at the rate of 10% per annum.

Anurag Mishra Professor Answered on 30th July 2015.
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