XYZ had no starting inventory and purchased inventory as follows: January 100 units at $10 per unit June 60 units for $15 per unit; October 40 units for $20 per unit; During the year they sold 170 units. 1. XYZ uses FIFO. What was the COGS ? 2. XYZ uses LIFO. What was the COGS ? 3. XYZ uses weighted average (WAVE) what was the average cost per unit? 4. XYZ uses weighted average (WAVE) what was the COGS