If the cost price of 50 articles is equal to the selling price of 28 articles, then the gain or loss percent is? Choose the correct answer
A) 22  B) 65  C) 78.57  D) 33  E) 25

Rationale: "given that , cost price of 50 article is equal to selling price of 28 articles . let cost price of one article = rs . 1 selling price of 28 articles = rs . 50 but cost price of 28 articles = rs . 28 therefore , the trader made profit . \ percentage of profit = 22 / 28 * 100 = 78.57 % answer : c"
Answer: C