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B-
111 %. By definition, the percent of any number a in any other number b is 100a/b.
a%b = a*b/100
A b is 80% - 89%
It is simply subtraction of the whole number from one hundredth of the percent: that is, A% - B = A/100 - B or (100*A - B)/100. It may be possible to simplify the answer.