Teacher Li bought 3 boxes of pens, 10 pens in each box, 12 yuan each. How much did Mr. Li spend on buying the pen?
李老师买了3盒钢笔，每盒10枝，每枝12元．李老师买钢笔一共用去多少钱？
<gadget id="calculator">3 * 10 * 12</gadget>
<output>360</output>

<result>360</result>