A sum of money becomes double in 3 years at compound interest compounded annually at the same rate. In how many years will it become four times of itself?

by

A. 07
B. 08
C. 06
D. 09

🧠 Explanation (Math):

Given: Money doubles in 3 years (annual compounding)
Step 1: Quadruple $=2times2$ ⇒ $3+3=6$ years.
Final Answer: 06