1, 2, 4, 8, 16.
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1, 2, 4, 8, 16, 32.
Each of these numbers will go evenly into 80: 1, 2, 4, 5, 8, 10, 16, 20, 40, 80.
These whole numbers go evenly into 64: 1, 2, 4, 8, 16, 32, 64.
20% of 80 is 16 and 80-16= 64
The largest number that will divide evenly into 64 with no remainder is 64.