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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
80 is an integer and so there is not really a sensible way of writing it as a fraction or mixed number.
30 is 80 percent of 37.5
20% of 450 is 90 So 80% of 450 will be 360
80 is a whole number.