Calculate a) cost of goods sold, b) ending inventory, and c) gross margin for B76 Company, considering the following transactions under three different cost allocation methods and using perpetual inventory updating. Provide calculations for last-in, first-out (LIFO).

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Beginning inventory Sold Purchased Sold Purchased Sold Ending inventory Number of Units 420 150 250 275 200 260 185 Unit Cost $200 205 215 Sales $401 421 441