If the cost price of 50 articles is equal to the selling price of 40 articles, then the gain or loss percent is?	Options
A) 33 %	B) 29 %	C) 25 %	D) 55 %	E) 39 %

Rationale: "c 25 % given that , cost price of 50 article is equal to selling price of 40 articles . let cost price of one article = rs . 1 selling price of 40 articles = rs . 50 but cost price of 40 articles = rs . 40 therefore , the trader made profit . \ percentage of profit = 10 / 40 * 100 = 25 %"
Answer: C