The factors of 72 are:
1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72
The factors of 99 are:
1, 3, 9, 11, 33, 99
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99 + 99 + 88 + 88 + 72 + 72 = 518
72/99 x 100 = 72.72 recurring (that is, 72.727272...) percent.
Apart from 1, all of the other factors of 72 are multiples of prime factors.
The prime factors for 72 are: 2, 3
9