The author of a book was told that he would have to cut the number of pages by 13% for the book to sell at a popular price and still make profit. If these cuts were made what percent of the original number of pages was the final version?

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If this book begins as 100% and he is asked to cut 13%, we need to subtract 100% - 13%.  This is the amount that remains.

`100% - 13% = 87%` .

`87%` of  the original number of pages are in the final version. 

If the book began with "x" pages,...

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If this book begins as 100% and he is asked to cut 13%, we need to subtract 100% - 13%.  This is the amount that remains.

`100% - 13% = 87%` .

`87%` of  the original number of pages are in the final version. 

If the book began with "x" pages, then the book after the cut would have 87% of x pages remaining, or `.87x`

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