Selected production and cost data of Lisa's Compound Co. follow for May 2018: (Click the icon to view the production and cost data.) On May 31, the Mixing Department ending Work-in-Process Inventory was 85% complete for materials and 40% complete for conversion costs. The Heating Department ending Work-in-Process Inventory was 75% complete for materials and 75% complete for conversion costs. The company uses the weighted-average method. Read the requirements.