EX 6-9 Weighted average cost flow method under perpetual inventory system The following units of a particular item were available for sale during the calendar year; Obj. 3 Jan. 1 Apr. 19 June 30 Sept. 2 Nov. 15 Inventory Sale Purchase Sale Purchase 4,000 units at $40 2,500 units 4,500 units at $44 5,000 units 2,000 units at $46 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. EX 6-10 Perpetual inventory using FIFO Obj. 3 Assume that the business in Exercise 6-9 maintains a perpetual inventory system. Determine the cost of goods sold for each sale and the inventory balance after each sale, assuming the first-in, first-out method. Present the data in the form illustrated in Exhibit 3