The pressure from water mains located at street level may be insufficient for delivering water to the upper floors of tall buildings. In such a case, water may be pumped up to a tank that feeds water to the building by gravity. For an open storage tank atop a 300 ft tall building, determine the pressure, in lbf/in^2, at the bottom of the tank when filled to a depth of 20 ft. The density of water is 62.2 lb/ft^3, g=32.0 ft/s^2, and the local atmospheric pressure is 14.7 lbf/in^2.