The water-supply manager for a Midwest city needs to supply the city with at least 13 million gal of potable (drinkable) water per day. The supply may be drawn from the local reservoir or from a pipeline to an adjacent town. The local reservoir has a maximum daily yield of 5 million gallons of potable water, and the pipeline has a maximum daily yield of 13 million gallons. By contract, the pipeline is required to supply a minimum of 9 million gallons/day. If the cost for 1 million gallons of reservoir water is $300 and that for pipeline water is $450, how much water should the manager get from each source to minimize daily water costs, C, for the city