Treebeard's Stumper

Take an ordinary piece of notebook paper and fold it in half, then fold it in half again across the first fold, and yet again.... Suppose you did this 50 times in a row. Assume the paper itself is a tenth of a millimeter thick (so 10 pieces are 1 millimeter thick) and ignore creases and air spaces if the paper is not pressed down absolutely tight. How thick would the final bundle be?
Answer
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