Shanta runs an industry in a shed which is in the shape of a cuboidsurmounted by a half cylinder. If the base of the shed is of dimension `7m xx15 m`, and the height of the cuboidal portion is 8 m, find the volume of air that the shed can hold.Further suppose the machinery in the shed occupies 300 `m^3` and 20 workers each of whom occupy 0.08 `m^3` space on an average.Then how much air is in the shed.