A cuboid wooden box is 0.6 meters long, 0.5 meters wide, and 0.4 meters high. At least how many square meters of wood boards are needed to make such a wooden box?
一个长方体木箱，长0.6米，宽0.5米，高0.4米．做一个这样的木箱至少需要多少平方米的木板？
<gadget id="calculator">0.6 * 0.5</gadget>
<output>0.3</output>

<gadget id="calculator">0.6 * 0.4</gadget>
<output>0.24</output>

<gadget id="calculator">0.5 * 0.4</gadget>
<output>0.2</output>

<gadget id="calculator">0.3 + 0.24 + 0.2</gadget>
<output>0.74</output>

<gadget id="calculator">0.74 * 2</gadget>
<output>1.48</output>

<result>1.48</result>