Schwiesow Corporation has provided the following information: Cost per Cost per Unit Period Direct materials $ 7.05 Direct labor $ 3.50 Variable manufacturing overhead $ 1.65 Fixed manufacturing overhead $ 11,000 Sales commissions $ 1.00 Variable administrative expense $ 0.40 Fixed selling and administrative expense $ 5,500 If the selling price is $18.70 per unit, the contribution margin per unit sold is closest to: