Aunt Wang’s family bought a new washing machine. Its outer packaging is a cuboid carton with a length of 0.6 meters, a width of 0.5 meters and a height of 0.8 meters. How many square meters of cardboard do you need to make such a carton? (negligible at joints)
王大妈家新买了一个洗衣机，它的外包装是一个长0.6米、宽0.5米、高0.8米的长方体纸盒．做这样一个纸盒至少需要多少平方米硬纸板？(接头处可忽略不计)
<gadget id="calculator">0.6 * 0.8</gadget>
<output>0.48</output>

<gadget id="calculator">0.6 * 0.5</gadget>
<output>0.3</output>

<gadget id="calculator">0.5 * 0.8</gadget>
<output>0.4</output>

<gadget id="calculator">0.48 + 0.3 + 0.4</gadget>
<output>1.18</output>

<gadget id="calculator">1.18 * 2</gadget>
<output>2.36</output>

<result>2.36</result>