Multiple choice

If a sum of money at simple interest doubles itself in 6 years, it will become four times in

  1. 14 years

  2. 12 years

  3. 18 years

  4. 16 years
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Simple interest: Amount doubles in 6 years means interest = principal in 6 years. To become 4 times, interest = 3 * principal. Time = 3 * 6 = 18 years.

AI explanation

If a sum of money doubles itself in 6 years, the simple interest earned equals the principal in 6 years. To become four times the original sum, the interest must equal three times the principal. Since one principal amount takes 6 years to accumulate, accumulating three principal amounts takes 3 * 6 = 18 years. The result is 18 years.

Keep practicing — related questions