Process Costing Abdurahman Company started 6,000 units during the month of March. 600 units were in the beginning work in process inventory and 400 units in the ending work in process inventory. Compute the number of Units completed and transferred out during March? Abdurahman Compagny is using process costing method. Discuss why the company is using process costing and discuss the difference between process costing and job costing.