Hoffman Company uses the weighted-average method in its process costing system. All materials are added at the beginning of the process. The following information pertains to its third processing department for the current month: Number of units Cost of materials Beginning work in process 120,000 $ 40,000 Ending work in process 100,000 Started during month 320,000 $108,000 Units completed 340,000 Part (a) What were the equivalent units of production for materials for the current month? Part (b) What is the cost per equivalent unit for materials for the current month?