a company manufactures mountain bikes. the research department produced the marginal cost fucntion c'(x) = 600 - x/3 x is greater than or equal to 0 and less than or equal to 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 0 bikes per month to 600 bikes per month. Set up a definite integral and evaluate it.