Kogler Corporation's relevant range of activity is 7,000 units to 11,000 units. When it produces and sells 9,000 units, its average costs per unit are as follows: Average Cost per Unit Direct materials $ 5.05 Direct labor $ 5. 10 Variable manufacturing overhead $ 1.85 Fixed manufacturing overhead $ 10.00 Fixed selling expense $ 3.65 Fixed administrative expense $ 1.90 Sales commissions $ 0.40 Variable administrative expense $ 0.35 If the selling price is $28.00 per unit, the contribution margin per unit sold is closest to: Multiple Choice O $15.25 ($0.30) O $6.00 O $17.85