Department W had 2,880 units, one-third completed at the beginning of the period; 12,800 units were transferred to Department X from Department W during the period; and 1,050 units were one-half completed at the end of the period. Assume the completion ratios apply to direct materials and conversion costs. The total number of units to be assigned cost on the cost of production report for Department W is a. 15,680 units b. 13,850 units c. 12,800 units d. 14,630 units