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If you take 80 percent of a number and get 645, then what is that number? In other words, you know that 80 percent of a number is 645 and you want to know what that initial number is.

To solve this problem you multiply 645 by 100 and then divide the total by 80 as follows: (645 x 100) / 80

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

806.25


Therefore, the answer to "645 is 80 percent of what number?" is 806.25, and you can also derive that 80 percent of 806.25 equals 645.

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