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If you take 80 percent of a number and get 4, then what is that number? In other words, you know that 80 percent of a number is 4 and you want to know what that initial number is.

To solve this problem you multiply 4 by 100 and then divide the total by 80 as follows: (4 x 100) / 80

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

5


Therefore, the answer to "4 is 80 percent of what number?" is 5, and you can also derive that 80 percent of 5 equals 4.

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