he inventory records for Radford Company reflected the following

Beginning inventory on May 1	100 units @ $4.00
First purchase on May 7	300 units @ $4.40
second purchase on May 17	500 units @ $4.60
Third purchase on May 23	100 units @ $4.80
Sales on May 31	900 units @ $7.80

What is the amount of cost of goods sold assuming the LIFO cost flow method is used?

$4,320

$4,100

$2,360

$3,600