A man buys an article for $100. and sells it for $125. Find the gain percent?
Select:
A) 10 %
B) 15 %
C) 25 %
D) 20 %
E) 30 %

Rationale: "c . p . = $ 100 s . p . = $ 125 gain = $ 25 gain % = 25 / 100 * 100 = 25 % answer is c"
Answer: C