The company estimates that the monthly demand for the region will be 550000 gall

    The company estimates that the monthly demand for the region will be 550000 gallons of gasoline. Because of the size and speed differences of the trucks the number of deliveries or round trips possible per month for each truck model will vary. Trip capacities are estimated at 15 trips per month for the Super Tanker 20 trips per month for the Regular Line and 25 trips per month for the Econo-Tanker. Based on maintenance and driver availability the firm does not want to add more than 15 new vehicles to its fleet. In addition the company has decided to purchase at least three of the new Econo-Tankers for use on short-run low-demand routes. As a final constraint the company does not want more than half the new models to be Super Tankers.a. If the company wishes to satisfy the gasoline demand with a minimum monthly operating expense how many models of each truck should be purchased?b. If the company did not require at least three Econo-Tankers and did not limit the number of Super Tankers to at most half the new models how many models of each truck should bepurchased?

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