By selling 95 pens, a trader gains the cost of 19 pens. Find his gain percentage?
Answers:
A) 20 % B) 21 % C) 22 % D) 23 % E) 24 %

Rationale: "let the cp of each pen be rs . 1 . cp of 95 pens = rs . 95 profit = cost of 19 pens = rs . 19 profit % = 19 / 95 * 100 = 20 % answer : a"
Answer: A