A cuboid chimney, each section is 2 meters high, the bottom surface is 4 decimeters long, and the height is 3 decimeters. How many square meters of iron sheet is needed to make such a chimney with 12 sections?
一种长方体烟囱，每节高2米，底面长4分米，高3分米，制作12节这样的烟囱，至少需要铁皮多少平方米？
<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">2 * (3/10)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">4 / 10</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) * 2</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(3/5) + (4/5)</gadget>
<output>7/5 = around 1.4</output>

<gadget id="calculator">(7/5) * 2 * 12</gadget>
<output>168/5 = around 33.6</output>

<result>168/5 = around 33.6</result>