EX 7-9 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: Jan. 1 Apr. 19 June 30 Sept. 2 Nov. 15 Inventory Sale Purchase Sale Purchase 4,000 units at $20 2,500 units 6,000 units at $24 4,500 units 1,000 units at $25 The firm uses the weighted average cost method with a perpetual inventory system. Determine the cost of merchandise sold for each sale and the inventory balance after each sale. Present the data in the form illustrated in Exhibit 5