Determine the optimal pricing strategy under each seating con…figuration option

need help to solve a problem. There 3 types of customer and willing to pay x=2500, y=1300, z=1300 for business class airline ticket. x=1300, y=1000, z=1000 for economy class ticket. i need help in determining optimal pricing strategy under each of this class provided marginal cost is zero. and to maximize revenue which class must be chosen..!!??