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 Apr. 19 June 30 Sept. 2 Nov. 15 The firm uses the weighted average cost method with a perpetual inventory system. Determin two decimal places, if necessary 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