Exhibit 7-9 Cost schedule for firm X OutputQuantity Total…

Exhibit 7-9 Cost schedule for firm X OutputQuantity Total FixedCost Total VariableCost 0 $100 $    0 1   100     50 2   100     84 3   100   108 4   100   127 5   100   150 As shown in Exhibit 7-9, the marginal cost of producing the third unit is: