How could a firm using the weighted average method of process costing calculate how many units were started during a period? Multiple Choice Subtract beginning units in inventory from units completed, then add ending units in inventory. Add beginning units in inventory, units completed, and ending units in inventory. Add units completed and beginning units in inventory, then subtract ending units in inventory. Subtract ending units in inventory from units completed, then add beginning units in inventory. Rathburn, Inc. is a service firm that uses process costing. The firm worked on a total of 1,300 cases this month, 800 of which were completed during the period. The remaining cases were 35% complete. The firm incurred $190,100 in direct labor and manufacturing overhead costs during the period, and had $4,900 in direct labor and manufacturing costs in beginning inventory. Using the weighted average method, what was the total cost of cases completed during the period? Multiple Choice $35,000 O $357,200 $160,000 $35,720