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PE 7-4B Perpetual inventory using weighted average OBJ. 3 Beginning inventory, purchases, and sales for J101 are as follows: Assuming a perpetual inventory system and using the weighted iverage method, determine (a) the weighted average unit cost after the October 22 purchase, (b) the cost of the merchandise sold on October 29, and (c) the inventory on October 31 . Purchases Cost of Merchandise Sold Inventory