help me find FIFO and LIFO and AVERAGE COST in part B2

Problem 6-3A (Part Level Submission) Windsor, Inc. had a beginning inventory on January 1 of 120 units of Product 4-18-15 at a cost of $22 per unit. During the year, the following purchases were made. Mar. 15 July 20 320 units 200 units at at $25 $26 Sept. 4 Dec. 2 280 units 80 units at at $28 $31 800 units were sold. Windsor, Inc. uses a periodic inventory system. (a) Your answer is correct. Determine the cost of goods available for sale. The cost of goods available for sale 26160 (61) Your answer is correct. Calculate average cost per unit. (Round answer to 2 decimal places, e.g. 2.23.) Average cost per unit 26.16 $ (b2) Determine (1) the ending inventory, and (2) the cost of goods sold under each of the assumed cost flow methods (FIFO, LIFO, and average-cost). Prove the accuracy of the cost of goods sold under the FIFO and LIFO methods. (Round answers to 0 decimal places, e.g. 1,250.) FIFO LIFO AVERAGE-COST The ending inventory The cost of goods sold s $