The school bought a batch of books and distributed them to 5 grades on average. Each grade has 4 classes, and each class has 100 books. How many books did the school buy in total?
学校买来一批书，平均分给5个年级，每个年级有4个班，每个班分100本书．学校一共买来多少本书？
<gadget id="calculator">100 * 4 * 5</gadget>
<output>2_000</output>

<result>2_000</result>