Generally, percentages refer to a ratio of some kind. If you had nine things out of ten things, that would be ninety percent. If you compared nine things to one thing, that would be nine hundred percent. If you had the decimal 0.09, meaning nine out of a hundred, that would be 9 percent.
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9/100
9% means 9/100 ======simplest form
1/2
36%
90% = 9/10 = 0.9