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A can usually has the shape of a cylinder.

A standard can with a volume of 0.25 l0{.}25\ \mathrm{l} has a diameter of 52 mm52\ \mathrm{mm} and height 132 mm132\ \mathrm{mm}, and 10.7 g10{.}7\ \mathrm{g} of aluminum is used for its production. A special offer “30%30 \% free” will use cans with a volume of 0.33 l0{.}33\ \mathrm{l}, diameter 63 mm63\ \mathrm{mm} and height 117 mm117\ \mathrm{mm}.

How will the material consumption change for one can? Also by 30%30 \%, or by a different ratio?

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