An airline agrees to charter planes for a group. The group needs at least 160 first class seats and at least 300 tourist class seats. The airline must use at least two of its model 314 planes which have 20 first class and 30 tourist class seats. The airline will also use some of its model 535 planes which have 20 first class seats and 60 tourist class seats. each flifgt of a model 314 costs rs 100,000. Each flight of a model 535 cost Rs. 150,000. How many of each type f plane should be used to minimize the flight cost? Formulate this as a LPP.