Required information [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, the March 9 sale consisted of 60 units from beginning inventory and 455 units from the March 5 purchase; the March 29 sale consisted of 135 units from the March 18 purchase and 215 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 laces and final answers to nearest whole dollar.)