The sum of money at compound interest amounts to thrice itself in 4 years. In how many years will it be 15 times itself?
Choices
A) 8 years	B) 16 years	C) 2 years	D) 6 years	E) 3 years
100 ---- 300 --- 4   900 --- 4   1200----4   1500---4   16 years   Answer: 16 years
<result>B</result>
The sum of money at compound interest amounts to thrice itself in 4 years. In how many years will it be 15 times itself?