The sum of money at compound interest amounts to thrice itself in 3 years. In how many years will it be 9 times itself?	Pick one.
A) 7 years B) 9 years C) 4 years D) 6 years E) 2 years
Explanation:   100 ---- 300 --- 3   900 --- 3   ----   6 years   Answer: Option 6 years
<result>D</result>
The sum of money at compound interest amounts to thrice itself in 3 years. In how many years will it be 9 times itself?