A certain sum of money doubles itself in 10 years in how much many years will it trible itself at the same rate?  Choose the correct choice from the following:  A) 20 years  B) 28 years  C) 24 years  D) 27 years  E) 57 years
100 ---- 100 --- 10   100 --- 10   --------------------   300 ---- 20 years   20 yearsnswer:20 years
<result>A</result>
A certain sum of money doubles itself in 10 years in how much many years will it trible itself at the same rate?