The sum of money at compound interest amounts to thrice itself in 5 years. In how many years will it be 15 times itself? Options
A) 8 years B) 9 years C) 10 years D) 25 years E) 3 years
100 ---- 300 --- 5   600 --- 5   900 ---5   1200 ---5   1500--- 5   25 years   Answer: 25 years
<result>D</result>
The sum of money at compound interest amounts to thrice itself in 5 years. In how many years will it be 15 times itself?