How many square centimeters of iron sheets are needed to make a ventilation pipe with a length of 1.2 meters and a width and height of 10 centimeters?
做一节长1.2米，宽和高都是10厘米的通风管，至少需要铁皮多少平方厘米？
<gadget id="calculator">1.2 * 100</gadget>
<output>120</output>

<gadget id="calculator">120 * 10 * 4</gadget>
<output>4_800</output>

<result>4_800</result>