Rusthe Inc. uses a periodic inventory system. Its records show the following for the month of May, in which 74 units were sold. Date Explanation Units Unit Cost Total Cost May 1 Inventory 30 $9 $270 15 Purchase 25 10 250 24 Purchase 38 11 418 Total 93 $938 x Your answer is incorrect. Calculate the ending inventory at May 31 using the FIFO, LIFO and average-cost methods. (Round answers to O decimal places, eg 125) The ending inventory at May 31 FIFO LIFO 270 AVERAGE-COST