This question mixes up two different concepts - that of the highest common factor (HCF) and lowest common multiple (LCM).
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8
72 / 64 = 1 r 8 64 / 8 = 8 r 0 GCF of 72 and 64 is 8.
(72 - 64)/72 x 100 = 11.1 recurring (that is, 11.1111...) percent.
8 because 64/72 = 8/9
The Greatest Common Factor (GCF) of 64 and 72 is 8.