Tirri Corporation has provided the following information: Cost per UnitCost per PeriodDirect materials$ 7.05 Direct labor$ 4.20 Variable manufacturing overhead$ 1.55 Fixed manufacturing overhead $ 23,500Sales commissions$ 1.15 Variable administrative expense$ 0.40 Fixed selling and administrative expense $ 7,900 If the selling price is $27.20 per unit, the contribution margin per unit sold is closest to: