XYZ Ltd. manufactures two products (P and Q) with the following data: Product P: Contribution ₹80/unit, machine hours 2 hrs/unit. Product Q: Contribution ₹120/unit, machine hours 3 hrs/unit. Available machine capacity: 1,200 hours. Market demand: P = 400 units, Q = 300 units. Using linear programming, what is the optimal production mix and maximum contribution?