How do you calculate the cost of goods sold expense that would be reported for the month of September if the FIFO inventory valuation method was used?

Units Dollars/Unit Beginning Inventory 9/1 17 $5.55 Purchases #1 - 9/3 15 $5.59 Purchases #2 - 9/8 24 $6.22 Purchases #3 - 9/16 20 $6.58 Purchases #3 - 9/23 12 $6.79 Purchases #4 - 9/29 18 $6.88 Sales 82