Company Y uses a periodic inventory system. During its first year of operations, the following purchases was made (listed in chronological order of acquisition): 40 units at $100 per unit Jan 15 70 units at $80 per unit - June 1 170 units at $60 per unit Nov 25 Sales for the year totaled 100 units 50 units at $100 per unit - Oct 1 50 units at $120 per unit Dec 25 Find COGS using the average