Calculate a) cost of goods sold, b) ending inventory, and c) gross margin for A76 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 240 160 520 400 400 370 230 Unit Cost $100 103 110 Sales $140 142 144