M$7-19($Supplement $7$A$)$ Calculating Cost of Goods Sold and Ending Inventory under FIFO and LIFO $($Perpetual Inventory$)$

Refer to M$7-10.$ Calculate the cost of ending inventory and cost of goods sold assuming a perpetual inventory system is used in combination with $($a$)$ FIFO and $($b$)$ LIFO.