Please explain step by step

Required information The Foundational 15 (LO1-1, LO1-2, LO1-3, LO1-4, LO1-5, LO1-6] [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 materials Direct labor Variable manufacturing overhead Fixed manufacturing overhead Fixed selling expense Fixed administrative expense Sales commissions Variable administrative expense Average Cost per Unit $6.00 $3.50 $1.50 $4.00 $3.00 $2.00 $1.00 $0.50 Foundational 1-13 13. If the selling price is $22 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