Barnett Company uses the weighted-average method in its process costing system. The company adds materials at the beginning of the process in Department M. Conversion costs were 75% complete with respect to the 4,000 units in work in process at May 1 and 50% complete with respect to the 6,000 units in work in process at May 31. During May, 12,000 units were completed and transferred to the next department. An analysis of the costs relating to work in process at May 1 and to production activity for May follows:. Materials ConversionWork in process, May 1 $13,800 $ 3,740Costs added during May $42,000 $26,260The total equivalent units of production for materials are:.The total cost per equivalent unit for May was:.