answer is either

1. 2920

2. 3420

3. 3000

4. 4020

The inventory records for Radford Co. reflected the following Beginning inventory@ May 1 First purchase@ May 7 second purchase @ May 17 Third purchase @May 23 Sales@ May 31 160 units $4.00 300 units@ $4.40 500 units @ $4.60 100 units@ $4.80 980 units@ $7.80 Determine the amount of gross margin assuming the FIFO cost flow method