A sum of money place at compound interest doubles itself in 10 years. In how many years will it amount to eight times itself?	Choose the correct choice from the following options:
A) 20
B) 30
C) 40
D) 50
E) 60
100 ---- 200 ---- 10   400 ---- 10   800 ---- 10   ------   12 years   Answer: 30
<result>B</result>
A sum of money place at compound interest doubles itself in 10 years. In how many years will it amount to eight times itself?