Teal Mountain Inc. uses a periodic inventory system. Its records show the following for the month of May, in which 79 units were sold. Date Explanation Units Unit Cost Total Cost May 1 Inventory $288 15 Purchase 225 24 Purchase 390 Total $903 Calculate the ending inventory at May 31 using the FIFO, LIFO and average-cost methods. (Round answers to O decimal places, eg. 125.) FIFO LIFO AVERAGE-COST The ending inventory at May 31 $