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Krepps Corporation produces a single product. Last year, Krepps manufactured 31,770 units and sold 26,400 units. Production costs for the year were as follows: Direct materials Direct labor Variable manufacturing overhead Fixed manufacturing overhead 228, 744 142,965 247,806 508,320 Sales totaled $1,161,600 for the year, variable selling and administrative expenses totaled $139,920, and fixed selling and administrative expenses totaled $225,567. There was no beginning inventory. Assume that direct labor is a variable cost. The contribution margin per unit was: Multiple Choice $20.30 per unit $19.20 per unit C