The cost price of 30 articles is the same as the selling price of x articles. If the profit is 20%, what is x?	Choose the correct choice:  A) 20  B) 21  C) 23  D) 25  E) 27

Rationale: "let the cost price = y the cost price of 30 articles = 30 y the selling price of x articles = 1.20 y * x 1.20 y * x = 30 y x = 30 / 1.2 = 25 the answer is d ."
Answer: D