By selling an article for $110, a person gains $10. What is the gain %?
Choose the correct choice from the following answers.
A) 25 %
B) 30 %
C) 50 %
D) 20 %
E) 10 %

Rationale: "s . p . = $ 110 gain = $ 10 c . p . = 110 - 10 = 100 gain % = 10 / 100 * 100 % = 10 % answer is e"
Answer: E