Filimonov Inc. has the following information related to purchases and sales of one of its inventory items: Refer to the information for Filimonov Inc. and assume that the company uses a periodic inventory system. This information has been collected in the Microsoft Excel Online file. Open the spreadsheet, perform the required analysis, and input your answers in the question below. Open spreadsheet Required: Calculate the cost of goods sold and the cost of ending inventory using the average cost method. (Note: Use four decimal places for per-unit calculations and round all other numbers to the nearest dollar.)