The debits to Work in Process-Assembly Department for April, together with data concerning production, are as follows: April 1, work in process: Materials cost, 3,000 units $ 7,490 Conversion costs, 3,000 units, 40% completed 5,916 Materials added during April, 10,000 units 25,097 Conversion costs during April 32,471 Goods finished during April, 12,000 units April 30 work in process, 1,000 units, 40% completed All direct materials are added at the beginning of the process, and the first-in, first-out method is used to cost inventories. The conversion cost per equivalent unit for April is a. $2.90 (D b. $2.82 c. $2.50 d. $3.25