There are 25 bookshelves in the school library, each shelf has 4 floors, and 80 books are placed on each floor, how many books are there in total?
学校图书馆有25个书架，每个书架有4层，每层放80本书，一共放多少本书？
<gadget id="calculator">25 * 4 * 80</gadget>
<output>8_000</output>

<result>8_000</result>