Question: DESIGNING A GRAIN SILO A grain silo has the shape of a right circular cylinder surmounted by a hemisphere (see the accompanying figure). If the silo is to have a capacity of 504p ft3 , find the radius and height of the silo that requires the least amount of material to construct. Hint: The volume of the silo is Πr2h + (2/3)Πr3, and the surface area (including the floor) is Π(3r2 + 2rh).