On most grading scales, yes:
100% - 98% A+
97% - 93% A
92% - 90% A-
89% - 88% B+
87% - 83% B
82% - 80% B-
etc.
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90 percent of what?
90%
90 - 20% = 72
To find 10 percent of a number, you divide the number by 10. So, 10 percent of 100 is 10. Subtracting 100 from 10 would give you -90. Therefore, the result of 10 percent minus 100 is -90.
45 - (9%) = 40.95