A company manufactures a product and the research department produced the 0x800 marginal cost function, Cl(x) 300 4 where C1(x) is in dollars and x is the number of units produced per month. Compute the increase in cost going from a production level of 400 units per month to 800 units per month. Set up a definite integral and evaluate it. 160 000 60 000 260 000 100 000