Let x be the unknown number.
Given that .8x = 64,
dividing each side by 0.8, then x = 64/.8 = 80
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64 is 80% of 80
To find 12.5 percent of a number, multiply that number by 0.125. In this instance, 0.125 x 64 = 8. Therefore, 12.5 percent of 64 is 8.
80%
The decrease from 80 to 64: 20%
64/80 = 8/10 = 80/100 = 80% 64 is 80% of 80.