0.9
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81 divided by 9 = 9 then 90 divided y 9 =10 answer is 9/10
100*81/90 = 90%
90 divided by 9 = 1090 - 9 = 81 = 9 x 988 - 81 = 79 times with 7 remaining
-100/63 ÷ 10/81 = -90/7 or -126/7
It is 90 because 90% of 90 = 81