Can someone help me with the steps to solving this?

Required information [The following information applies to the questions displayed below.] The following are the transactions for the month of July. Required: a. Calculate cost of goods available for sale and ending inventory under LIFO. Assume a periodic inventory system is used. b. Calculate sales, cost of goods sold, and gross profit, under LIFO. Assume a periodic inventory system is used. Complete this question by entering your answers in the tabs below. Calculate sales, cost of goods sold, and gross profit, under LIFO. Assume a periodic inventory system is used