99
90 + (0.10 x 90) = 90 + 9 = 99
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99
10% of 90 = 990% 0f 10 = 9(10% of 90) + (90% of 10) = 18
88
90% of 10 = 0.90 x 10 = 980% of 90% of 10 = 0.80 x 9 = 7.2
90 percent out of 100 percent = 9/10 or 0.990%/100% = 9/10 or 0.9