A sum of money becomes triple itself in 5 years at simple interest. How many years will it become seven times at the same rate?
Choose one
A) 12 Â½ years B) 62 Â½ years C) 18 Â½ years D) 72 Â½ years E) 14 Â½ years
100 ---- 200 ---- 5   200 ---- 5   100 ---- 2 1/2   ------------------   700 ---- 14 Â½ years   Answer:14 Â½ years
<result>E</result>
A sum of money becomes triple itself in 5 years at simple interest. How many years will it become seven times at the same rate?