The school bought back 20 boxes of chalk, 40 boxes in each box, and 8 yuan per box. How much is the total cost?
学校买回20箱粉笔，每箱40盒，每盒8元，一共用去多少元？
<gadget id="calculator">20 * 40 * 5</gadget>
<output>4_000</output>

<result>4_000</result>