A certain sum of money doubles itself in 7 years in how much many years will it trible itself at the same rate? Pick:
A) 20 years B) 14 years C) 88 years D) 44 years E) 11 years
100 ---- 100 --- 7   100 --- 7   --------------------   300 ---- 14 years   Answer: 14 years
<result>B</result>
A certain sum of money doubles itself in 7 years in how much many years will it trible itself at the same rate?