Chapter 3, Problem 3.9P

I need assistance with this general accounting question using appropriate principles.

Delta's inventory records for February reflect the following details: On February 1, the beginning inventory consisted of 250 units priced at $3.20 each. On February 9, Delta made its first purchase of 350 units at a cost of $3.50 each. A second purchase was made on February 18, consisting of 500 units priced at $3.70 each. By the end of the month, on February 28, Delta sold 700 units at a price of $6.50 per unit. Using the FIFO (First-In, First-Out) cost flow method, what is the cost of goods sold (COGS) for February? Help

I need help finding the accurate solution to this general accounting problem with valid methods.