A tank, shaped like a cone has height 99 meter and base radius 11 meter. It is placed so that the circular part is upward. It is full of water, and we have to pump it all out by a pipe that is always leveled at the surface of the water. Assume that a cubic meter of water weighs 10000N, i.e. the density of water is 10000Nm^3. How much work does it require to pump all water out of the tank? Enter the exact value of your answer.
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