1/2 inventory 300 units 3000$ 2/2 purchases 500 units 7500$ 3/2 sold units 600 units For 12000$ cash 5/2 Purchase 400 units 1.4$per unit 6/2 Units sold 450 units For 2.5$ for each Under 1) perpetual system -FIFO method and WA method compute Gross margin 2) under periodical system Compute Gross margin using FIFO and WA