PR 7-4B Periodic inventory by three methods The beginning inventory for Dunne Co. and data on purchases and sales for a three-month period are shown in Problem 7-1B. Instructions 1. Determine the inventory on June 30 and the cost of merchandise sold for the three- OBJ. 2, 3 entory 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 merchandise sold for the three- month period, using the last-in, first-out method and the periodic inventory system. 3. Determine the inventory on June 30 and the cost of merchandise sold for the three- month period, using the weighted average cost method and the periodic inventory system. Round the weighted average unit cost to the dollar. 4. Compare the gross profit and June 30 inventories using the following column headings: FIFO LIFO Weighted Average Sales Cost of merchandise sold Gross profit Inventory, June 30