Based on past experience, demand forecasters at Ivy Air have determined the following upper bounds on the number of potential customers in each of the 9 possible origindestinationffareclass combinations: lthicaNewark NewarkBoston IthicaBoston The goal is to decide how many tickets from each of the 9 origin / destination f fareclass combinations to sell. The constraints are that the plane cannot be overbooked on either of the two legs of the ight and that the number of tickets made available cannot exceed the forecasted maximum demand. The objective is to maximize the revenue. Formulate this problem as a linear programming