If an item that originally sold for z dollars was marked up by x percent and then discounted by y percent, which of the following expressions represents the final price of the item? a. (10,000z + 100z(x â y) â xyz)/10,000b. (10,000z + 100z(y â x) â xyz)/10,000c. (100z(x â y) â xyz)/1d. (100z(y â x) â xyz)/1e. 1 /(x â y)