The sum of money at compound interest amounts to thrice itself in 3 years. In how many years will it be 9 times itself? Options.
A) 8 years  B) 9 years  C) 2 years  D) 6 years  E) 3 years
100 ---- 300 --- 3   900 --- 3   ----   6 years   Answer: 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?