Alex sells cars at Keith Palmer ford. He earns 400 dollars a week plus 150 dollars per car he sells.

Alex sells cars at Keith Palmer ford. He earns 400 dollars a week plus 150 dollars per car he sells. If he earned 1450 dollars last week, how many cars did he sell?

Subtract the base salary of $400
$1,450 - 400 =$1,050

Divide this by 150 per car
$1,050/$150 = 7 cars