Hi there!
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I believe your answer is:
800 books.
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Here’s why:
- As mentioned in the question, there are 4,000 books signed out during the summer.
- 20% out of the 4,000 were teen romance books.
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![\boxed{\text{20 Percent of 4,000:}}\\\\\rightarrow 4,000* (20/100)\\\\\rightarrow \boxed{800}](https://img.qammunity.org/2022/formulas/mathematics/college/smkjn2687czwow274r9zignrbjxc9rys4a.png)
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There should be 800 books that were teen romance.
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Hope this helps you. I apologize if it’s incorrect.