solve it please

b) A price-discriminating monopolist sells in two separate markets at prices Pl andP2. The relevant demand and marginal revenue schedules are (for positive values of O) P1 = 12-0.1501 P2 =9-0.07502 MR1 = 12-0.301 MR2 = 9-0.1502 It is assumed that output is allocated between the two markets according to the price discrimination revenue-maximizing criterion that MR1 = MR2. Derive a formula for the aggregate margina revenue schedule which is the horizontal sum of MRI and MR2. (Marks.. 3+3)