[The following information applies to the questions displayed below.] Martinez Companys relevant range of production is 7,500 units to 12,500 units. When it produces and sells 10,000 units, its average costs per unit are as follows: Average Cost Per Unit Direct materials $ 5.20 Direct labor $ 2.70 Variable manufacturing overhead $ 1.50 Fixed manufacturing overhead $ 4.00 Fixed selling expense $ 2.20 Fixed administrative expense $ 2.00 Sales commissions $ 1.00 Variable administrative expense $ 0.50 13. If the selling price is $21.20 per unit, what is the contribution margin per unit? (Do not round intermediate calculations. Round your answer to 2 decimal places.)