EX 7-9 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 1 dteminventoryni gnl4,000 units at $20 bon 041 obna voinsvrApr. n19otob Salemdpe mn 2,500 unitsmuza Purchase e 6,000 units at $24 dt 2all ngle Sept.2 Salerollo isrh 4,500 units nlah o ebonsc Nov.m15tn ,no Purchasep os 1,000 units at $25 Jan. June 30 The firm uses the weighted average cost method with a perpetual inventory system. 1ard 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. R P