I really don't understand how to calculate these using LIFO, FIFO, and WA...

M7-7 Calculating Cost of Goods Available for Sale, Cost of Goods Sold, and Ending Inventory under FIFO, LIFO, and Weighted Average Cost (Periodic Inventory) [LO 7-3] Aircard Corporation tracks the number of units purchased and sold throughout each accounting period but applies its inventory costing method at the end of each period as if it uses a periodic inventory system. The following are the transactions for the month of July July 1 July 5 July 13 July 17 July 25 July 27 Beginning Inventory Sold Purchased Sold Purchased Sold Units Unit Cost 2,000 $50 1,000 6,000 3,000 8,000 5,000 54 56 Calculate the cost of goods available for sale, ending inventory, and cost of goods sold if Aircard uses (a) FIFO, (b) LIFO, or (c) weighted average cost. (Round "Cost per Unit" to 2 decimal places.) Weighte Average Cost FIFO LIFO Cost of Goods Available for Sale Ending Inventory Cost of Goods Sold