Department W had 2,460 units, one-third completed at the beginning of the period; 13,100 units were transferred to Department X from Department W during the period; and 1,800 units were one-half completed at the end of the period. Assume the completion ratios apply to direct materials and conversion costs. The equivalent units of production used to compute unit conversion cost on the cost of production report for Department W, assuming the company uses FIFO, are

a.17,360 units b.13,180 units c.10,640 units d.12,280 units