Tirri Corporation has provided the following information: Cost per Cost per Unit Period Direct materials $ 6. 65 Direct labor $ 3. 40 Variable manufacturing overhead $ 1. 15 Fixed manufacturing overhead $22, 700 Sales commissions $ 1. 10 Variable administrative expense $ 0.45 Fixed selling and administrative expense $ 7, 100 If the selling price is $26.40 per unit, the contribution margin per unit sold is closest to: Multiple Choice $16.35 O $6.10