pls answer a & b, thank you!

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 avaliable for sale and ending inveritory 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. Complete this question by entering your answers in the tabs below. Calculate cost of goods avallable for sale and ending inventory under LIFO. Assume a periodic inventory system 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