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Anonymous
The GCF is 13.
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13.
Factors of 91: 1, 7, 13, 91Factors of 117: 1, 3, 9, 13, 39, 117GCF (91, 117) = 13
The GCF is 9.
It is: (117-78)/78 times 100 = 50% increase
117