In how much time will the simple interest on a certain sum of money be times of the sum at 20% per annum?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 6 years
Let the principal be P.
= (P × 20 × t)/100 = 6/5 × P
= Pt/5 = 6P/5
= t = 6 years.