Struggling with this. Can i please getca step by step on all 12 fill in the blanks?

Required information [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. Compute gross profit earned by the company for each of the four costing methods. For specific identification, units sold include 120 its from beginning inventory, 250 units from the March 5 purchase, 100 units from the March 18 purchase, and 140 units from the arch 25 purchase. (Round weighted average cost per unit to two decimais and final answers to nearest whole dollar.)