A car salesman earns a base salary of $1,000 per month plus a commission of $200 for each car he sells. If the car salesman earned $1800 in January, how many cars does he need to sell in February in order to double his January earnings? Choose one.
A) 13	B) 14	C) 15	D) 16	E) 17
1000+200x=3600   x=13 cars.   The answer is 13.
<result>A</result>
A car salesman earns a base salary of $1,000 per month plus a commission of $200 for each car he sells. If the car salesman earned $1800 in January, how many cars does he need to sell in February in order to double his January earnings?