Tirri Corporation has provided the following information: Cost Cost per per Unit Period Direct $ 6.85 materials Direct labor $ 3.90 Variable manufacturing $ 1.25 overhead Fixed manufacturing $ 22,500 overhead Sales $ 1.00 commissions Variable administrative $ 0.55 expense Fixed selling and $7500 administrative expense If the selling price is $26.20 per unit, the contribution margin per unit sold is closest to manufacturing $ 22,500 overhead Sales $ 1.00 commissions Variable administrative $ 0.55 expense Fixed selling and $7,500 administrative expense If the selling price is $26.20 per unit, the contribution margin per unit sold is closest to Select one: O A. $9.70 OB. $12.65 O C. $6.65 OD. $15.45