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4. The following information is taken from a perpetual inventory record. Perpetual Inventory Control Record Description: M & B Supreme Date Purchase Received Issued Sales Units Unit Cost June 1 Balance forward 3 $10.00 $10.50 6 $11.00 WN WN NW N 6 $ 9.50 For each of the following inventory valuation methods, calculate the value of ending inventory and the cost of sales as of June 30. 1.First-in, first-out method 2.Last-in, first-out method 3. Weighted average method