Evaluate the integral. x dx O x dx = (Type an integer or a simplified fraction.)A company manufactures mountain bikes. The research department produced the marginal cost function C'(x) = 700 - -, 0Sx$ 900, where C'(x) is in dollars and x is the number of bikes produced per month. Compute the increase in cost going from a production level of 450 bikes per month to 900 bikes per month. Set up a definite integral and evaluate it. The increase in cost is $