The debits to Work in Process-Assembly Department for May, together with data concerning production, are as follows: May 1, work in process: Materials cost, 3,000 units $8,300 Conversion costs, 3,000 units, 50% completed 5,200 Materials added during May, 10,000 units 27,900 Conversion costs during May 34,800 Goods finished during May, 11,500 units May 31 work in process, 1,500 units, 50% completed 0 All direct materials are placed in process at the beginning of the process and the first-in, first-out method is used to cost inventories. The materials cost per equivalent unit for May is O a. 52.43 Ob. 5348 O $2.79 Od 54:31 0