The marginal cost function associated with producing x widgets is given by C'(x) = -0.6x + 60 where C'(x) is measured in dollars/unit and x denotes the number of widgets. If the daily fixed costs incurred in the production is $800, find the total cost C(x) incurred in producing the first 100 units of the day $3,900 $4,300 $3,800 $4,200 $3,400