4 boxes of pens, each box of 10 pens, each sold for 8 yuan, how much can be sold in total.
4盒钢笔，每盒10枝，每枝卖8元，一共可卖多少元．
<gadget id="calculator">4 * 10 * 8</gadget>
<output>320</output>

<result>320</result>