A manufacturing company makes two models A and B of a product. Each piece of Model A requires 10 labour hours for fabricating and 0.7 labour hour for finishing. Each piece of Model B requires 15 labour hours for fabricating and 2 labour hours for finishing. For fabricating and finishing, the maximum labour hours available are 180 and 30 respectively. The company makes a profit of Rs 9000 on each piece of model A and Rs 11000 on each piece of Model B. We have to maximize the profit. What is the objective function for this linear programming problem? Assume The company produces x pieces of model A and y pieces of model B.