Sandhill Co, uses a periodic inventory system. Its records show the following for the month of May, in which 79 units were sold. Unit Cost Date May 1 Explanation Inventory Units 30 $8 15 15 Purchase Total Cost $240 225 360 $825 24 Purchase 36 10 Total 91 Calculate the ending inventory at May 31 using the FIFO, LIFO and average cost methods. (Round answers to decimal places, s. 125.) FIFO LIFO AVERAGE-COST The ending inventory at May 31 $