It is 90 because 90% of 90 = 81
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First, we can truncate the .00 off of the 90.00 to just make 90 for simplicity. Next, we take .10*90, which is 9. Subtract that from your original number, 90. 90-9=81. There is another way to do this problem. First, we have 100 percent, or 1. Next, we subtract 10 percent from that, or .1. 1-.1=.9, so we multiply .9*90=81.
10 percent of 90 is 9 so 30 percent will be 9 times 3 which is 27
20% of 450 is 90 So 80% of 450 will be 360
Percent is hundredths. So 81% =0.81
200% of a number is 90, so 100% of a nubmer is 45, so 45 is 80% 0f a number therfore a number is 45/80*100=225/4