Department S had no work in process at the beginning of the period. It added 14,800 units of direct materials during the period at a cost of $103,600; 11,100 units were completed during the period; and 3,700 units were 32% completed as to labor and overhead at the end of the period. All materials are added at the beginning of the process. Direct labor was $58,700 and factory overhead was $8,800. The total cost of units completed during the period was a.$77,700 b.$138,694 c.$130,742 d.$166,433