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Periodic inventory by three methods The units of an item avallable for sale during the year were as follows: There are 1,500 units of the item in the physical inventory at December 31 . The periodic inventory system is used. a. Determine the inventory cost by the first-in, first-out method. b. Determine the inventory cost by the last-in, first-out method. c. Determine the inventory cost by the weighted average cost method. Round average unit cost to two decimal places