Question: A solid shaft of (100 mathrm{~mm}) diameter is to be replaced by a hollow shaft with internal diameter equal to (40 %) of external diameter.

A solid shaft of $100 \mathrm{~mm}$ diameter is to be replaced by a hollow shaft with internal diameter equal to $40 \%$ of external diameter. Find the size of hollow shaft and saving in material. Both the shafts are made of same material.

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