The inventory records for Radford Company reflected the following Beginning inventory on May 1 1,600 units @ $4.80 First purchase on May 7 1,700 units @ $5.00 Second purchase on May 17 1,900 units @ $5.10 Third purchase on May 23 1,500 units @ $5.20 Sale on May 31 5,100 units @ $6.70 What is the amount of gross margin assuming the weighted average cost flow method is used? (Round your intermediate calculations to 2 decimal places.)