44.4444.
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If you mean how do you find 40% of 90, then one way to do it would be to find 1% (which you do by dividing the original amount - in this case 90 - by 100) and then multiply that number by the percentage you are trying to find, in this case 40. So, that would mean dividing 90 by 100, which gets 0.9, and then multiplying that by 40, which ends up with equals 36.
percentage of 90 out of 100 = 90%% rate:= 90/100 * 100%= 90%
90*40= 3600
20 out of 90 as a percentage is about 22.22%.
Percentage of 64.75 out of 90 is about 71.944%.