Pedregon Corporation has provided the following information:

	Cost per Unit			Cost per Period
Direct materials	$	7.00
Direct labor	$	3.60
Variable manufacturing overhead	$	1.25
Fixed manufacturing overhead				$	10,800
Sales commissions	$	0.45
Variable administrative expense	$	0.55
Fixed selling and administrative expense				$	3,200

If the selling price is $21.40 per unit, the contribution margin per unit sold is closest to