If the -1 refers to the exponent, it is 8.9/10=0.89. If not, then 89-1 which equals 88.
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Subtracting 10 percent from 89 dollars gives 89 x (1 - (10/100)) = 89 x 0.9 = $80.10
10/11/89 in Roman numerals is X - xi - lxxxix
89 i - 1 x - 10 l - 50 50+10+10+10+(10-1) = 89
1 x 89, 89 x 1
12 = (1 x 101) + (2 x 100) OR (1 x 10) + (2 x 1).