A company manufactures mountain bikes. The research department produced the marginal cost function C'(x)=400 -
x/3 0 less than or equals x less than or equals 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 600 bikes per month to 900 bikes per month. Set up a definite integral and evaluate it.