Problem 3 (16) 69) A company uses the periodic system to account for inventory. For the year, the company had the following beginning inventory and purchases: Beginning inventory on January 1100 units at$2,800 per unit Purchase on March 1 400 units at$3,000 per unit Purchase on September 1 800 unitsat$3,200 per unit Sales for the year totaled 1,000 units. Show all computations. Compute the cost of ending inventory and COGS using: a) FIFO b) LIFO c) Average cost