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If you take 90 percent of a number and get 80, then what is that number? In other words, you know that 90 percent of a number is 80 and you want to know what that initial number is.

To solve this problem you multiply 80 by 100 and then divide the total by 90 as follows: (80 x 100) / 90

When we put that into our calculator, we get the following answer:

88.89


Therefore, the answer to "80 is 90 percent of what number?" is 88.89, and you can also derive that 90 percent of 88.89 equals 80.

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