The final stage of production adds Material Z to units that have been transferred into Process D and converts them to the finished product. There are no losses in Process D. Data for Process D in the latest period are shown below: Units Opening work in progress Material Z: 80% complete Conversion costs: 80% complete Units transferred in Units transferred out Closing work in progress Material Z: 60% complete Conversion costs: 40% complete 225 500 575 150 The equivalent units to be used in the calculations of the cost per equivalent unit for Material Z and Conversion Costs, assuming first-in-first-out (FIFO) costing are: Material Z Conversion costs A 485 455 B 485 500 575 455 575 500