Tirri corporation has provided the following information: cost per unit cost per period direct materials $ 7.45 direct labor $ 3.75 variable manufacturing overhead $ 1.50 fixed manufacturing overhead $ 24,300 sales commissions $ 1.00 variable administrative expense $ 0.80 fixed selling and administrative expense $ 8,700 if the selling price is $28.00 per unit, the contribution margin per unit sold is closest to: tirri corporation has provided the following information: cost per unit cost per period direct materials $ 7.45 direct labor $ 3.75 variable manufacturing overhead $ 1.50 fixed manufacturing overhead $ 24,300 sales commissions $ 1.00 variable administrative expense $ 0.80 fixed selling and administrative expense $ 8,700 if the selling price is $28.00 per unit, the contribution margin per unit sold is closest to: tirri corporation has provided the following information: cost per unit cost per period direct materials $ 7.45 direct labor $ 3.75 variable manufacturing overhead $ 1.50 fixed manufacturing overhead $ 24,300 sales commissions $ 1.00 variable administrative expense $ 0.80 fixed selling and administrative expense $ 8,700 if the selling price is $28.00 per unit, the contribution margin per unit sold is closest to: 13.50 7.05 16.80 10.75