A sum of money becomes triple itself in 5 years at simple interest. How many years will it become four times at the same rate?	Choose the correct option
A) 12 Â½ years
B) 62 Â½ years
C) 8 Â½ years
D) 72 Â½ years
E) 12 Â½ years
100 ---- 200 ---- 5   200 ---- 5   100 ---- 2 1/2   ------------------   400 ---- 8 Â½ years   Answer:8 Â½ years
<result>C</result>
A sum of money becomes triple itself in 5 years at simple interest. How many years will it become four times at the same rate?