Table 13-18 Labor Output Marginal Variable Fixed Product Cost Cost $0 $10 1 200 200 $20 $10 12 350 $40 $10 3 450 $60 $10 4 50 $80 $10 5 25 $100 $10 6 530 $120 $10 Refer to Table 13-18. What is the total output of four workers