Tirri Corporation has provided the following information: Cost per Unit Co'st per Period Direct materials $6.90 Direct labor $3.90 Variable manufacturing overhead Fixed manufacturing overhead Sales commissions Variable administrative expense $1.40 $23,200 $1.00 $0.70 Fixed selling and administrative expense $ 7,600 If the selling price is $26.90 per unit, the contribution margin per unit sold is closest to Multiple Choice $13.00 Multiple Choice $13.00 $700 $16.10 $10.00