17. A manufacturer produced mountain bikes. The 18. The total cost (in dollars) of printing x dictionaries research department produced the marginal profit (in is dollars) function C(x) = 30,000 + 15x. p1 = 700 - 0.4x 0 5 x 5 900 Find the average value of the cost function over the where x is the number of bikes produced per month. interval [0, 700]. Compute the increase in profit going from a production level of 250 bikes per month to 900 bikes per month. Set up a definite integral and evaluate it. 19. Given the demand function 20. Given the supply function 3,000 p = D(x) = p = S(x) = 20e 0.02x X Find the average price (in dollars) over the supply find the average price (in dollars) over the demand interval [25, 50]. interval [450, 650]