The list of a certain tool is x dollars. in store a the original selling price of the tool was $50 less than the list price, and the current selling price is 10% less than the original selling price. in store b the original selling price of the tool was 10% less than the list price, and the current selling price is $50 less than the original selling price.

a) quality a is greater
b) quality b is greater
c) the two quantities are equal