Pedregon Corporation has provided the following information:

	Cost per Unit			Cost per Period
Direct materials	$	7.15
Direct labor	$	3.90
Variable manufacturing overhead	$	1.40
Fixed manufacturing overhead				$	16,200
Sales commissions	$	0.60
Variable administrative expense	$	0.70
Fixed selling and administrative expense				$	6,600

If the selling price is $21.70 per unit, the contribution margin per unit sold is closest to: