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) = 0.03x^3 + 0.2x^2 + 60x + 110; x = 500
The marginal-cost function is C'(x).
The marginal cost when x = 500 is $. (Round to two decimal places as needed.)