Can I please get some help?

The periodic inventory records of Flexon Prosthetics indicate the following for the month of July: a (Click the icon to view the inventory records.) At July 31, Flexon counts four units of inventory on hand. a. Compute ending merchandise inventory and cost of goods sold using the FIFO inventory costing method. b. Compute ending merchandise inventory and cost of goods sold using the weighted-average-cost method. a. FIFO Cost b. Weighted Average Ending Merchandise Inventory |:| |:| Cost of Goods Sold |:||:| Jul. 1 Beginning merchandise inventory 6 units @ $ 60 each 8 Purchase 5 units @ $ 67 each 15 Purchase 10 units @ $ 70 each 26 Purchase 5 units @ $ 85 each