Ending inventory is only 30 percent complete as to conversion cost, so it represents
30% × 3,600 = 1,080 equivalent units of labor and overhead. Because materials are added before firing in the Molding Department and spoilage occurs as a result of firing at the 80-percent stage of conversion, each spoiled unit in Molding contains one equivalent unit of material (2,400 equivalent units) and 80 percent of an equivalent unit of conversion cost (2,400 units × 80% complete = 1,920 equivalent units). Equivalent units for each cost element in the Molding Department are