Exercise 9-13 (Algo) Retail inventory method; average cost [LO9-3] San Lorenzo General Store uses a periodic inventory system and the retail inventory method to estimate ending inventory and cost of goods sold. The following data are available for the month of October 2021: Required: Complete the table below to estimate the average cost of ending inventory and cost of goods sold for October using the Information provided. (Round ratio calculation to 2 decimal places (i.e., 0.1234 should be entered as 12.34%.. Enter amounts to be deducted with a minus sign.)