If the cost price of 55 articles is equal to the selling price of 50 articles, then what is the percent profit?  Pick one:  A) 5%  B) 10%  C) 15%  D) 20%  E) 25%
Let x be the cost price of one article.   Let y be the selling price of one article.   50y = 55x   y = 1.1x   The answer is 10%.
<result>B</result>
If the cost price of 55 articles is equal to the selling price of 50 articles, then what is the percent profit?