Weighted Average Cost Flow Method Under Perpetual Inventory System The following units of a particular item were available for sale during the calendar year: The firm uses the weighted average cost method with a perpetual inventory system. Determine the cost of goods sold for each sale and the inventory sale. Present the data in the form illustrated in Exhibit 5. Round unit cost to two decimal places, if necessary. each sale and the inventory balance after each ase by dividing the total of cost of goods on hand by the total of sales by the units sold. The inventory balance after a sale is