A spherically shaped balloon has a radius of 8.5m and is filled with helium. How much extra mass can a cargo lift, assuming that the skin and the cargo of the balloon have a mass of 1200kg? Neglect the buoyant force on the cargo volume itself. (The density of air is 1.29 kg/m^3 and the density of helium is 0.179 kg/m^3).

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