eriodic Inventory by Three Methods The beginning inventory for Dunne Co. and data on purchases and sales for a thren-month period are as follows: Required: 1. Determine the inventory on June 30 and the cost of goods sold for the three-month period, using the firat-in, first-out method and the inventory system. 1. Determine the inventory on June 30 and the cost of poods sold for the three-month period, using the first-in, first-out method and the periodic inventory system. 2. Determine the inventory on June 30 and the cost of goods sold for the three-month period, wsing the last-in, first-out method and the penodic inventory system. 3. Determine the inventory on June 30 and the cost of goods sold for the three-month period, using the weighted average cost method and the periodic inventory systern. Note: Round the weighted average unit cost to the nearest dollar and final answers to the nearest dollac: 4. Compare the gross profit and June 30 inventories using the following column headings. For those boxts in which you must enter suberacted or negative numbers use a minus sign