A car salesman earns a base salary of $800 per month plus a commission of $200 for each car he sells. If the car salesman earned $1600 in May, how many cars does he need to sell in June in order to double his May earnings? Pick:
A) 10  B) 11  C) 12  D) 13  E) 14
800+200x=3200   x=12 cars.   The answer is 12.
<result>C</result>
A car salesman earns a base salary of $800 per month plus a commission of $200 for each car he sells. If the car salesman earned $1600 in May, how many cars does he need to sell in June in order to double his May earnings?