Required information [The following information applies to the questions displayed below.] Warnerwoods Company uses a perpetual inventory system. It entered into the following purchases and sales transactions for March. 4. Compute gross profit earned by the company for each of the four costing methods. For specific identification, units sold inciude 140 units from beginning inventory, 270 units from the March 5 purchase, 120 units from the March 18 purchase, and 160 units from the March 25 purchase. (Round weighted average cost per unit to two decimals and final answers to nearest whole dollar)