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 answers.
A) 20  B) 88  C) 77  D) 66  E) 21
100 ---- 100 --- 10   100 --- 10   --------------------   300 ---- 20 years   20nswer: 20
<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?