A silo consists of a right circular cylinder surmounted by a hemisphere. Find the most economical proportions for the silo, if the walls cost P4/sq in, the floor costs P8/sq in, and the roof costs P12/sq in Height of silo is equal to 3/2 of the cylinder's diameter Height of silo is equal to 2/7 of the cylinder's diameter Height of silo is equal to 3 times the cylinder's diameter Height of silo is equal to 7/2 of the cylinder's diameter

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