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 31 500 units @ $2.60 600 units @ $2.80 800 units @ $2.90 400 units @ $3.00 1,800 units @ $4.50 What is the amount of gross margin assuming the weighted-average inventory cost flow method? (Round your intermediate calculations to two decimal places.) Multiple Choice $3,006 $5,400 O $2,700 O O $2,520