An octogenarian.
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Not sure about rotating an octogen (a person aged between 80 and 90 years) but an octagon can have rotational symmetry of order 0, 2, 4 or 8.
80% of 90m = 80% * 90 = 0.8 * 90 = 72m
Octogenarian.
80% of 90 Euros= 80% * 90 Euros= 0.8 * 90 Euros= 72 Euros
80 is 88.9% of 90.