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 $2200 in July, how many cars does he need to sell in August in order to double his July earnings?
Choose the correct choice from the following answers:
A) 15 B) 16 C) 17 D) 18 E) 19
800+200x=4400   x=18 cars.   The answer is 18.
<result>D</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 $2200 in July, how many cars does he need to sell in August in order to double his July earnings?