Aircard Corporation tracks the number of units purchased and sold throughout each accounting period but applies its inventory

costing method at the end of each period as if it uses a periodic inventory system. The following are the transactions for the month of

July.

Calculate the cost of goods available for sale, ending inventory, and cost of goods sold if Aircard uses $($a$)$ FIFO, $($b$)$ LIFO, or $($c$)$ weighted

average cost. $($Round "Cost per Unit" to $2$ decimal places.$)$