Becky sets up a hot dog stand in her busy neighborhood and purchases x pounds of hot dogs for r dollars per pound. If she has to throw away s pounds of hot dogs due to spoilage and she sells the rest of the hot dogs for d dollars per pound, which of the following represents the net profit on the sale of the hot dogs? Pick.
A) (x – s)r – sd B) xr – (xd – sd) C) xd – sr D) (x – s)d – xr E) (s – r)d – xr
Answer D:   The amount of hotdogs she can sell is x-s. The price per pound is d, so the revenue is (x-s)d. The total costs are x time r, so the profit is (x-s)d-xr.
<result>D</result>
Becky sets up a hot dog stand in her busy neighborhood and purchases x pounds of hot dogs for r dollars per pound. If she has to throw away s pounds of hot dogs due to spoilage and she sells the rest of the hot dogs for d dollars per pound, which of the following represents the net profit on the sale of the hot dogs?