help with the three required steps , will upvote

Required information [The following information applies to the questions displayed below] Hemming Co. reported the following current-year purchases and sales for its only product. Required: Hemming uses a perpetual inventory system. 1. Determine the costs assigned to ending inventory and to cost of goods sold using FFFO. 2. Determine the costs assigned to ending inventory and to cost of goods sold using LIFO. 3. Compute the gross margin for FIFO method and LIFO method. Determine the costs assigned to ending inventory and to cost of goods sold using FIFO. Determine the costs assigned to ending inventory and to cost of goods sold using LIFO. Perpetual LIFO: Compute the gross margin for FIFO method and LIFO method