Warnerwoods Company uses a perpetual inventory system. It entered into the following purchases and sales transactions for March. Problem 6-1A (Static) Part 4 4. Compute gross profit earned by the company for each of the four costing methods. For specific identification, units sold include 80 units from beginning inventory, 340 units from the March 5 purchase, 40 units from the March 18 purchase, and 120 units from the March 25 purchase. (Round weighted average cost per unit to 2 decimal places.)