For the cost function below, where C is the cost of producing x units of a product, find the marginal-cost function. What is the marginal cost at the given value of x? C(x) = 0.04x + 0.6x + 50x +90; x= 400 The marginal-cost function is C'(x) = The marginal cost when x= 400 is $. (Round to two decimal places as needed.)

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