Can't seem to figure out the answer for the marginal cost

uction. Total Labor Marginal Variable Total Average Marginal Shirts Revenue Revenue Fixed Cost Cost Cost Total Cost Cost 1 40 $200 $5 $75 $20 $95 So.50 2 68 $340 $75 $40 $115 $1.69 SO.71 W 95 $475 $75 $60 $135 $1.42 120 $600 $75 $80 $155 $1.29 $0.80 The average cost at the first level of production is The marginal cost at the third level of production is