The charges to Work in Process-Assembly Department for a period, together with information concerning production, are as follows. All direct materials are placed in process at the beginning of production. Determine the following: a. The number of units in work in process inventory at the end of the period. units Work in Process-Assembly Department Equivalent Units of Production for Direct Materials and Conversion Costs c. Costs per equivalent unit for direct materials and conversion. d. Cost of the units started and completed during the period