use weighted average method

Problem On August 1, Torun Company had a Beginning WIP inventory of 10,000 units (80% complete for Materials; 40% complete for Conversion, with respective costs of $20,000 and $6,000). During the month, 18,000 units were transferred out and 4,000 units remained in Ending WIP inventory (60% complete with respect to Materials; 20% complete with respect to Conversion costs). Costs added during the month were $41,200 for Materials and $27,840 for Conversion.