Consider table 3.1. What is the dollar amount of average variable cost per unit at the production level of 400 units? Production Rent Wages Supplies Tools Total Cost (units) 0 $300 $200 $0 $100 $600 100 $300 $410 50 $200 $960 200 $300 $650 $100 $300 $1,350 300 $300 $900 $150 $400 $1,750 400 $300 $1,200 $200 $500 $2,200 500 $300 $1,520 $250 5600 $2,670 600 $300 $1,905 $300 $700 $3,205 700 $300 $2,300 $350 $800 $3,750 lect one: a. 3 b. 4 c. 5 d. 6