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, units sold include 70 units from beginning inventory. 380 units from the March 5 purchase. 70 units from the March 18 purchase. and 150 units from the March 25 purchase. 4. Compute gross profit earned by the company for each of the four costing methods. (Round your average cost per unit to 2 declmo ploces and final onswers to nearest whole dollar.)