Question: In a company's process costing system, the cost of direct materials is $8 per unit, and the conversion cost is $12 per unit. If there are 500 units in beginning WIP inventory, 8,000 units started, and 7,500 units completed, what is the total cost of units completed? a. $150,000. b. $120,000. c. $100,000. d. $140,000.