The debits to Work in Process-Assembly Department for April, together with data concerning production, are as follows: April 1, work in process: Conversion costs, 3,000 units, 60% completed Materials added during April, 10,000 units Conversion costs during April Goods finished during April, 12,000 units April 30 work in process, 1,000 units, 40% completed 7,200 6,000 25,000 35,750 All direct materials are added 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 April is . $5.25 b. $2.48 Oc. $2.08 Od. $2.50