Multiple choice general knowledge math & puzzles

Certain money becomes double in 4 years according to simple interest. In how many years, will it becomes 3 times?

  1. 8 years

  2. 10 years

  3. 12 years

  4. 2 years

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Under simple interest, if the principal doubles in 4 years, the interest earned equals the principal in 4 years. To become 3 times, the interest must equal twice the principal, which takes 2 x 4 = 8 years.