Pedregon Corporation has provided the following information: Cost per UnitCost per Period Direct materials$ 6.35 Direct labor$ 3.75 Variable manufacturing overhead$ 1.50 Fixed manufacturing overhead $ 15,000 Sales commissions$ 0.50 Variable administrative expense$ 0.55 Fixed selling and administrative expense $ 4,500 If the selling price is $20.60 per unit, the contribution margin per unit sold is closest to: