A certain sum of money doubles itself in 15 years in how much many years will it trible itself at the same rate?
Answers
A) 20 years	B) 30 years	C) 88 years	D) 44 years	E) 11 years
100 ---- 100 --- 15   100 --- 15   --------------------   300 ---- 30 years   Answer: 30 years
<result>B</result>
A certain sum of money doubles itself in 15 years in how much many years will it trible itself at the same rate?