If variable manufacturing costs are $8 per unit and total fixed manufacturing costs are $444,000, what is the manufacturing cost per unit if a. 6,000 units are manufactured and the company uses the variable costing concept? $ b. 7,400 units are manufactured and the company uses the variable costing concept? $ c. 6,000 units are manufactured and the company uses the absorption costing concept? $ d. 7,400 units are manufactured and the company used the absorption costing concept?