An airline offers economy and business class tickets. For the airline to be profitable, it must sell a minimum of 25 business class tickets and a minimum of 40 economy tickets. The airline makes a profit of P3500 for each economy ticket and P6000 for each business class ticket. Let x and y be the number of economy and business class tickets, respectively. Which of the following is not a constraint in the problem? A y2 25 B x20 C) x2 40 D 3500x + 6000y

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