PB 11. LO 10.3 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 weighted average (AVG). Number of Units Beginning inventory 420 Sold Purchased 250 Sold Purchased Sold 260 Ending inventory 185 150 205 THE 275 200 215 421 441 Unit Cost Sales $200 $401