Preble Company manufactures one product. Its variable manufacturing overhead is applied to production based on direct labor-hours and its standard cost card per unit is as follows: Direct materials: 6 pounds at $8 per pound Direct labor: 4 hours at $17 per hour Variable overhead: 4 hours at $4 per hour Total standard cost per unit $48 68 16 $ 132 The planning budget for March was based on producing and selling 19,000 units. However, during March the company actually produced and sold 24,000 units and incurred the following costs: a. Purchased 160,000 pounds of raw materials at a cost of $7.20 per pound. All of this material was used in production. b. Direct laborers worked 72,000 hours at a rate of $18 per hour. c. Total variable manufacturing overhead for the month was $336,960.