Ivanhoe Company uses the perpetual inventory system and the LIFO method. The following information is available for the month of May: May 1 Beginning inventory 10 Purchase 15 18 21 30 Sales Purchase Sales Purchase 50 units @ $9 50 units @ $10 42 units 40 units@ $12 48 units 40 units @ $13 Prepare a schedule to show cost of goods sold and the value of the ending inventory for the month of May.