A certain sum of money doubles itself in 10 years in how much many years will it trible itself at the same rate? Select:
A) 20
B) 99
C) 88
D) 77
E) 54
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?