The inventory records for Radford Co. reflected the following Beginning inventory @ May 1 500 units @ $ 2.60 First purchase @ May 7 600 units @ $ 2.80 second purchase @ May 17 800 units @ $ 2.90 Third purchase @ May 23 400 units @ $ 3.00 Sales @ May 31 1,800 units @ $ 4.50 Determine the amount of cost of goods sold assuming the LIFO cost flow method.