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E6-4 Rusthe Inc. uses a periodic inventory system. Its records show the following for the month of May, in which 74 units were sold. Unit Total lanation Units Cost Cost Date May 1 Inventory 15Purchase 24 Purchase 30 25 38 93 $9 $270 250 10 1141 Total $938 Instructions Calculate the ending inventory at May 31 using the (a) FIFO, (b) LIFO, and (c) average-cost methods. (For average-cost, round the average unit cost to three decimal places.) Prove the amount allocated to cost of goods sold under each method Calculate cost of goods sold using specific identification and FIFO periodic