A sum of money becomes double itself in 4 years at simple interest. How many times will it become 10 years at the same rate?  Choose one:
A) 1
B) 2
C) 3
D) 4
E) 5
P ---- 2P ---- 4 years
5P ---- 10 years Answer: 5
<result>E</result>
A sum of money becomes double itself in 4 years at simple interest. How many times will it become 10 years at the same rate?