The school bought 4 boxes of pens, 10 pens in each box, and 16 yuan each. How much did you spend in total?
学校买了4盒钢笔，每盒10枝，每枝16元．一共用了多少钱？
<gadget id="calculator">4 * 10 * 16</gadget>
<output>640</output>

<result>640</result>