Tirri Corporation has provided the following Information: Cost per Unit Cost per Period Direct materials Direct labor variable manufacturing overhead Pixed manufacturing overhead Sales commissions Variable administrative expense Fixed selling and administrative expense $7.50 $3.85 $1.55 $24,400 $1.05 $0.60 $ 8,800 If the selling price is $28.10 per unit, the contribution margin per unit sold is closest to: Multiple Choice $16.75 O $705 $13.55 $10.70