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An author has received an advance against royalties of $10,000. The royalty rate is $1.00 for every book sold in the United States, and $1.35 for every book sold outside the United States. Define variables for this problem and write an expression that could be used to calculate the number of books to be sold to cover the advance.

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Solution Summary

Define variables for this problem and write an expression that could be used to calculate the number of books to be sold to cover the advance.

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There are two unknown values in this problem: the number of books the author sells in the US and the number of books that are sold outside the US.

Let us say that x is the number of books the author sells in the US, and y is the number of books the author sells ...

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