[The following information applies to the questions displayed below] Warnerwoods Company uses a periodic inventory system. It entered into the following purchases and sales transactions for March. For specific identification, units sold include 90 units from beginning irventory, 375 units from the March 5 purchase. 85 units from the March 18 purchase, and 165 units from the March 25 purchase. Compute gross profit earned by the company for each of the four costing methods. (Round your average cost per unit to 2 decimal leces and final answers to neerest whole dollar.)