Flounder Corp.uses a periodic inventory system. Its records show the following for the month of May, in which 73 units were sold. Date Explanation Units Unit Cost Total Cost May 1 Inventory 29 $9 $261 15 Purchase 23 10 230 24 Purchase 35 11 385 Total 87 $876 Calculate the ending inventory at May 31 using the FIFO, LIFO and average-cost methods. (Round answers to 0 decimal places, e.g. 125.) FIFO LIFO AVERAGE-COST The ending inventory at May 31 $ $ $