Norman Works for Honda Oshawa on Commission Only

Multiple Choice

Norman works for Honda Oshawa on commission only. He gets $500 for every used car he sells and $750 for every new car. Last month he sold 9 used cars and 4 new cars. What was his gross earning last month?

A) $7500
B) $4500
C) $2250
D) $2700
E) $5625