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Beginning inventory, purchases, and sales for Product XCX are as follows: $15 Sep. 1 Beginning Inventory 26 units 5 Sale 12 units 17 Purchase 28 units 30 Sale 18 units $17 Assuming a perpetual inventory system and the last-in, first-out method, determine (a) the cost of the goods sold for the September 30 sale and (b) the inventory on September 30. a) Cost of goods sold b) Inventory, September 30