The debits to Work in ProcessAssembly Department for April, together with data concerning production, are as follows: April 1, work in process: Materials cost, 3,000 units $ 7,200 Conversion costs, 3,000 units, 60% completed 6,000 Materials added during April, 10,000 units 25,000 Conversion costs during April 35,750 Goods finished during April, 12,000 units 0 April 30 work in process, 1,000 units, 40% completed 0 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

a.$5.25

b.$2.50

c.$2.48

d.$2.08