still need help solve this one

eBook 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 weighted average (AVG). Round "Unit Cost" answers to 2 decimal places and other answers to the nearest dollar amount. Number of Units Unit Cost Sales 260 $100 Beginning Inventory Sold 160 $140 Purchased 500 103 Sold 400 142 Purchased 420 110 Sold 370 174