Martinez company's relevant range of production is 7,500 units to 12,500 units. when it produces and sells 10,000 units, its average costs per unit are as follows: average cost per unit direct materials $ 6.80 direct labor $ 4.30 variable manufacturing overhead $ 1.60 fixed manufacturing overhead $ 4.00 fixed selling expense $ 3.80 fixed administrative expense $ 2.20 sales commissions $ 1.20 variable administrative expense $ 0.45 if 8,000 units are produced and sold, what is the variable cost per unit produced and sold?