Required information [The following information applies to the questions displayed below.) 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 materialo Direct labor Variable manufacturing overhead Fixed manufacturing overhead Fixed selling expense Fixed administrative expense Sales commissions Variable administrative expense Average Cost Per Unit $ 5.10 5 2.60 $ 1.60 $4.00 $ 2.10 $ 2.10 51.10 $0.55 13. If the selling price is $21.10 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