A person buys an article at $500. At what price should he sell the article so as to make a profit of 20%?
Choose the correct choice from the following:  A) 560  B) 449  C) 600  D) 740  E) 460

Rationale: "c 600 cost price = $ 500 profit = 20 % of 500 = $ 100 selling price = cost price + profit = 500 + 100 = 600"
Answer: C