Airtight Limited uses the weighted-average method in its process costing system. It manufactures a sealant that goes through three processing stages prior to completion. Information on work in the first department, Mixing, is given below for September: 20,000 95,000 ? 10,000 Production data: Units in process, 1 September; materials 100% complete; conversion 80% complete Units started into production during September Units completed and transferred out Units in process, 31 September; materials 70% complete; conversion 40% Cost data: Work in process inventory, 1 September: Materials cost Conversion cost Cost added during May: Materials cost Conversion cost $31,000 $23,000 $193,000 $140,500 Required: 1. Calculate the equivalent units of production for materials and conversion for September. (2 marks) 2. Calculate the cost per equivalent unit for materials and conversion for September. (1 mark) 3. Calculate the cost of ending work in process inventory in total for September. (1 mark) 4. What is the amount of the cost to be accounted for that would appear in the cost reconciliation report for September? (1 mark)