[" An aeroplane can carry a maximum of "200" passengers.A profit of Rs "1000" is "],[" made on each executive class ticket and a profit of Rs "600" is made on each "],[" economy class ticket.The airline reserves at least "20" seats for exceutive class."],[" However,at least "4" times as many passengers prefer to travel by economy class."],[" than by the executive class.Determine how many tickets of each type must be "],[" sold in order to maximise the profit for the airline.What is the maximum profit? "]