Marginal Revenus of a Commuter Air Service Williams Commuter Air Service realizes a monthly revenue repre price charged per passenger is x dollars. R(X) = 4,800x - 80x2 (a) Find the marginal revenue R'(x). R'(X) = (b) Compute the following values. R'(29) = R'(30) = R'(31) = (c) Based on the results of part (b), what price (in dollars) should the airline charge in order to maximize their revenue? $