A man buys an article for $10. and sells it for $15. Find the gain percent?	Options:
A) 25 %
B) 50 %
C) 20 %
D) 15 %
E) 30 %

Rationale: c . p . = $ 10 s . p . = $ 15 gain = $ 5 gain % = 5 / 10 * 100 = 50 % answer is b
Answer: B