Barredo Corporation's relevant range of activity is 3,000 units to 7,000 units. When it produces and sells 5,000 units, its average costs per unit are as follows:

	Average Cost per Unit
Direct materials	$	6.60
Direct labor	$	3.65
Variable manufacturing overhead	$	1.65
Fixed manufacturing overhead	$	2.80
Fixed selling expense	$	0.70
Fixed administrative expense	$	0.40
Sales commissions	$	0.50
Variable administrative expense	$	0.45

If 4,000 units are sold, the variable cost per unit sold is closest to: