(20 points) Assume a railway serves two classes of shippers - we'll call them captive and non-captive shippers. The market demands for the two classes are; Captive: QC = 70 - PC Non-captive: QNC = 80 - 2PNC You also know the railway has marginal costs of $10 in each market, plus there is a fixed cost of the rail track, which is $1200