Purchase QTY 1-Jan Beg 300 units 16-Jan Purchase 200 units 20-Jan Purchase 300 units 800 units Unit cost $14 per unit $15 per unit = $16 per unit Total Cost $ 4,200 $ 3,000 $ 4,800 $ 12,000 Sales 15-Jan unit selling price $30 per unit $35 per unit 200 units 460 units 660 units Total Sales $6,000 $16,100 $22,100 28-Jan X Pls using FIFO and MWA to calculate the following 1) please calculate what is the ending inventory balance 2) Please calculate what is the COGS 3) Please calculate what is the gross margin 4) What are the entries for Inventory purchase and inventory sales