A cuboid of wood is 4 meters long, 0.5 meters wide, and 2 decimeters thick. If it is sawed into 4 sections, the surface area will increase by at least how many square decimeters.
一根长方体木料，长4米，宽0.5米，厚2分米，把它锯成4段，表面积最少增加多少平方分米．
<gadget id="calculator">0.5 * 10</gadget>
<output>5</output>

<gadget id="calculator">5 * 2 * 6</gadget>
<output>60</output>

<result>60</result>