Krepps Corporation produces a single product. Last year, Krepps manufactured 27,970 units and sold 22,200 units. Production costs for the year were as follows: Direct materials. Direct labor Variable manufacturing overhead. Fixed manufacturing overhead 234,948 131,459 240,542 335,640 6.03 Sales totaled $1,043,400 for the year, variable selling and administrative expenses totaled $113,220, and fixed selling and administrative expenses totaled $198,587. There was no beginning inventory. Assume that direct labor is a variable cost. The contribution margin per unit was: Multiple Choice $15.70 per unit $25.30 per unit $20.20 per unit