The outer packaging box of a refrigerator is a cuboid with a length and a width of 4 decimeters. 1.2 meters high. If joints are not counted, how many square meters of cardboard are needed to process such a packaging box?
一种冰箱的外包装盒是一个长方体，长和宽都是4分米．高1.2米．如果不计接头，加工这样一个包装盒需要硬纸板多少平方米？
<gadget id="calculator">4 / 10</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) * (2/5)</gadget>
<output>4/25 = around 0.16</output>

<gadget id="calculator">(2/5) * 1.2</gadget>
<output>0.48</output>

<gadget id="calculator">(4/25) + 0.48 + 0.48</gadget>
<output>1.12</output>

<gadget id="calculator">1.12 * 2</gadget>
<output>2.24</output>

<result>2.24</result>