In How Much Time, Amount Equal to the Principal? If

If the simple interest for 6 years be equal to 30 % of the principal, it will be equal to the principal after .

  1. 10 years
  2. 20 years
  3. 22 years
  4. 30 years
Desire Adnan Default Asked on 7th August 2015 in Maths.
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    Answer: (2) 20 years

    Explanation:-
    Let the principal be P  and the rate of interest be R

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

    According to the question,
    30 P /100 = P x R x 6/100
    30 P = P x R x 6
    30 = R x 6
    R = 30 /6
    R = 5 %

    Then,  P = P x 5 x T/100
    T = 100/5
    T = 20 years
    Hence, the answer is (2) 20 years.

    Anurag Mishra Professor Answered on 7th August 2015.
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