Flint Corporation 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 15 Purchase - 34 - 24 - 42 100 $9 10 11 $306 240 462 $1,008 24 Purchase Total Calculate the weighted-average unit cost. (Round answer to 3 decimal places, e.g. 5.125.) Weighted-average unit cost $ 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 $