An aeroplane can carry a maximum of 200 passengers. a profit of rs1000 is made on each executive class ticket and a profit of rs600 is made on each economy class ticket. the airlines reserves atleast 20 seats for executiveclass. however, atleast 4 times as many passengers prefer to travel by the executive class. determine how many tickets of each type must be sold in order to maximise the profit for the airlines. what is the maximum profit?