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B0d under each method. 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. Explanation UnitsUnit Cost Total Cost May 1 15 24 Inventory Purchase Purchase Total 30 25 38 93 $ 9 10 $270 250 418 86 $938 Instructions Calculate the ending inventory at May 31 using the (a) FO, b) LIFO, and (e) average cost methods. (For average-cost, round the average unit cost to three decimal places.) Prove the amount allocated to cost of goods sold unde encs rethod