A company produces single product. Variable production costs are $12.40 per unit and variable selling and administrative expenses are $3.40 per unit. Fixed manufacturing overhead totals $40,000 and fixed selling and administration expenses total $44,000. Assuming a beginning inventory of zero, production of 4,400 units and sales of 3,800 units, the dollar value of the ending inventory under variable costing would be: a. $9,480 O b. $12,840 O c. $7,440 O d. $5,400