A cuboid candy box with a length of 12 cm, a width of 9 cm and a height of 20 cm, with a circle of trademark paper pasted around it (not on the top and bottom). How many square meters of label paper is needed to make such 100 candy boxes?
一个长方体的糖果盒，长12厘米，宽9厘米，高20厘米，围着它贴一圈商标纸(上下面不贴)．要做这样的100个糖果盒至少需要多少平方米的商标纸？
<gadget id="calculator">12 * 20</gadget>
<output>240</output>

<gadget id="calculator">9 * 20</gadget>
<output>180</output>

<gadget id="calculator">240 + 180</gadget>
<output>420</output>

<gadget id="calculator">420 * 2 * 100</gadget>
<output>84_000</output>

<result>84_000</result>