Play Time is a nursery school for pre-kindergarten children. The school has determined that the following biweekly revenues and costs occur at different levels of enrollment:

Number of Students Enrolled		Total Revenue				Total Costs
12		$	3,000			$	1,700
17			4,250				2,700
18			4,500				2,880
22			5,500				3,630
23			5,750				3,715

The average cost per student when 18 students enroll in the school is:

Multiple Choice

$180.

$159.

$160.

$250.

$750.