The inventory records for Radford Company reflected the following: Beginning inventory @ May 1 First purchase @ May 7 Second purchase @ May 17 Third purchase @ May 23 Sales @ May 31 700 units @ $3.00 800 units @ $3.20 1,000 units @ $3.30 600 units @ $3.40 2,400 units @ $4.90 What is the amount of gross margin assuming the weighted average inventory cost flow method? (Round your intermediate calculations to two decimal places.)