Explanation please

Tree Seedlings has the following current-year purchases and sales for its only product. Required: The company uses a perpetual inventory system. a. Determine the costs assigned to ending inventory and to cost of goods sold using FIFO. b. Determine the costs assigned to ending Inventory and to cost of goods sold using LIFO. c. Compute the gross margin for each method. Determine the costs assigned to ending inventory and to cost of goods sold using LIFO