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Use this information about Department S to answer the question that follow. Department'S had no work in process at the beginning of the period. It added 12,000 units of direct materials during the period at a cost of $84,000. During the period, 9,000 units were completed, and 3,000 units were 30% 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 $49,500, and factory overhesd was $9,900. The total cost of units completed during the period was - 5127.450 b. 5143,400 c. 5121,009 d. 5117,000