A sum of money becomes triple itself in 5 years at simple interest. How many years will it become six times at the same rate?
Choose the correct answer.
A) 12 ½ years  B) 62 ½ years  C) 18 ½ years  D) 72 ½ years  E) 12 ½ years
100 ---- 200 ---- 5   200 ---- 5   100 ---- 2 1/2   ------------------   600 ---- 12 ½ years   12 ½ yearsnswer:12 ½ years
<result>A</result>
A sum of money becomes triple itself in 5 years at simple interest. How many years will it become six times at the same rate?