1. Xander Studios holds a sculpting class for which it charges students $250. The costs consist of the following:

   Variable costs per student:
   Sculpting supplies	$ 100
   Enrollment costs	50
   Fixed costs for the course:
   Instructor's salary	$1,000
   Rental cost of the classroom	500

   The break-even number of students is

   	a.	20
   	b.	12
   	c.	2
   	d.	11