Refer to Table 5-1. The Steel Shelf company has variable costs per unit of ________ .

Table 5-1. Steel Shelf Company
Category Cost	Payment Period	Cost
Rent	Monthly	$ 3,000
Utilities	Monthly	1,100
Insurance	Quarterly	1,200
Property Taxes	Annually	6,000
Steel	Per Shelf	9.00
Forming	Per Shelf	0.25
Labor	Per Shelf	0.75
Price	Per Shelf	20.00