[The following information applies to the questions displayed below] Wamerwoods 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 soid include 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 decimais ond final answers to neorest whole dollar.)