Weighted average cost flow method under perpetual inventory system The following units of a particular item were available for sale during the calendar year: Jan. 1 Inventory 4,000 units at $50 Apr. 19 Sale 2,500 units June 30 Purchase 4,500 units at $54 Sept. 2 Sale 5,000 units Purchase 2,000 units at $56 Nov. 15 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 balance after each sale. Present the data in the form illustrated in Exhibit 5. Purchases Date Quantity Purchases Unit Cost Purchases Total Cost Quantity Weighted Average Cost Flow Method Cost of Goods Sold Cost of Goods Sold Unit Cost Cost of Goods Sold Total Cost I Jan. 1 Apr. 19 June 30 Sept. 2 Nov. 15 Dec. 31 Balances