If the cost price of 60 articles is equal to the selling price of 40 articles, then what is the percent profit?  Choose the correct choice from the following options: A) 30% B) 40% C) 50% D) 60% E) 70%
Let x be the cost price of one article.   Let y be the selling price of one article.   40y = 60x   y = 1.5x   The answer is 50%.
<result>C</result>
If the cost price of 60 articles is equal to the selling price of 40 articles, then what is the percent profit?