The horizontal cross section of a well containing mineral water is a circle of radius 4ft. The cost of pumping the water to an outlet at the top of the well is 2 centavos per ft-lb of work done. If the mineral water weighs 62.5 lb/ft3 and is sold for 20opesos per cu. ft., find the depth to which the water is to be pumped out to realize a maximum profit. Select one: a. 20ft b. 13ft c. 16ft Od. 11ft The correct answer is: 16ft

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