4.4 Suppose that the annual demand by adults for playing golf at Crabgrass Country Club is QA = 120 - PA and the annual demand by junior golfers is QJ = 80 - PJ These demands can be rewritten to express the price as a function of the quantity:

PA = 120 - QA and PJ = 80 - QJ If the marginal cost of a round of golf is $30 and the club can set different annual dues for adults and juniors, what should the club manager set as the annual dues and the greens fee? Explain your answer.