Last year, fixed manufacturing overhead was $30,000, variable production costs were $48,000, fixed selling and administration costs were $20,000, and variable selling administrative expenses were $9,600. There was no beginning inventory. During the year, 3,000 units were produced and 2,400 units were sold at a price of $40 per unit. Under variable costing, net income would be: a. a profit of $6,000. b. a profit of $4,000. c. a loss of $2,000. d. a loss of $4,400