EX 6-8 Weighted average cost flow method under perpetual inventory system Obj. 3 The following units of a particular item were available for sale during the calendar year: 10,000 units at $75.00 1 Mar. 18 May 2 Aug. 9 Oct. 20 Inventory Sale Purchase Sale Purchase 8,000 units 18,000 units at $77.50 15,000 units 7,000 units at $80.25 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. Pres- ent the data in the form illustrated in Exhibit 5