E7.5 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 12 Inventory 30- 5240- 15 Purchase 25- 11 275 24 Purchase 45 130 585 Total 100- $1,100 $8- Instructions Calculate the ending inventory at May 31 using the (a) FIFO. (b) LIFO, and (c) average-cost methods. Prove the amount allocated to cost of goods sold under each method. (a) FIFO tttt (b) LIFO- tttt tttt (c) Average-cost ttttttttt