Warnerwoods Company uses a periodic inventory system. It entered into the following purchases and sales transactions for March. For specific identification, units sold include 60 units from beginning inventory, 455 units from the March 5 purchase, 195 units from the March 18 purchase, and 215 units from the March 25 purchase Problem 6-2AA (Algo) Part 4 4. Compute gross profit earned by the company for each of the four costing methods Note: Round your average cost per unit to 2 decimal places and final answers to nearest whole dollar