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.

Units Unit Cost

July $1$ Beginning Inventory $2,000$ $ $40$

July $5$ Sold $1,000$

July $13$ Purchased $6,00044$

July $17$ Sold $3,000$

July $25$ Purchased $8,00050$

July $27$ Sold $5,000$