(Appendix 68) Inventory Costing Methods: Periodic Average Cost Filimonov Inc. has the following information related to purchases and sales of one of its inventory items: Assume that Flimonov uses a periodic inventory systemi Requiredt Colculate the cost of goods sold and the cost of ending inventory using the average cost methed. (Note: Use four decimal places for per-unit calculations and roun all other-numbers to the nearest dollar.)