The inventory records for Abeer Co. reflected the following. Beginning Inventory 100 units@ $4.00 First Purchase 250 units@ $4.50 Second Purchase 300 units @ $5.00 Third Purchase 200units@ $5.50 Sold 600 units @ $7.00 per unit. A. Calculate Cost of goods sold under EIFO. B. Calculate ending inventory under LIFO. C. Calculate Gross margin under weightage average method