October 1 Beginning inventory 8 units at $25 each October 8 Purchase 15 units at $20 each October 15 Purchase 15 units at $32 each October 26 Purchase 12 units at $35 each pop-up content ends PrintDone The periodic inventory records of Cambridge Prosthetics indicate the following for the month of October: At October 31, Cambridge counts four units of inventory on hand. a. Compute ending inventory and cost of goods sold using the FIFO inventory costing method. b. Compute ending inventory and cost of goods sold using the weighted-average-cost method