these are all the same question. please solve this right i keep getting wrong answers. please help me with this.

Eren Montoure Company uses a perpetual inventory system. It entered into the following calendar-year purchases and sales transactions. 4. Compute gross profit earned by the company for each of the four costing methods. Note: Round your average cost per unit to 2 decimal places. Compute the cost assigned to ending inventory using specific identification. (For specific identification, units sold consist of 600 units from beginning inventory, from the February 10 purchase, 190 from the March 13 purchase, 140 from the August 21 purchase, and 315 from the September 5 purchase.) Compute the cost assigned to ending inventory using weighted average. Note: Round your average cost per unit to 2 decimal places. Compute the cost assigned to ending inventory using LIFO. Note: Round your average cost per unit to 2 decimal places