Martinez Company's 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: Direct materials Direct labor Fixed manufacturing overhead Fixed selling expense Fixed administrative expense Sales commissions Variable administrative expense Average Cost Per Unit $ 5.30 $ 2.80 Variable manufacturing overhead $ 1.40 $ 4.00 $ 2.30 $ 2.20 $ 1.20 $ 0.45 13. If the selling price is $21.30 per unit, what is the contribution margin per unit? (Do not round intermediate calculations. Round your answer to 2 decimal places.) Contribution margin per unit