A company began the year and had made purchases of product "Z" as follows: Jan. 1 opening inventory 400 units @ $ 14.00 each Mar. 10 purchased 200 units @ $ 15.00 per unit sold 200 units (selling price was $30.00 per Jan.15 unit) April 1 sold 250 units (selling price was $30.00 per unit) Assuming that the company uses a perpetual inventory system with FIFO method