A cuboid is 1.25 meters long, 0.8 meters wide, and 0.5 meters high, find its surface area.
一个长方体长1.25米，宽0.8米，高0.5米，求它的表面积．
<gadget id="calculator">1.25 * 0.8</gadget>
<output>1</output>

<gadget id="calculator">1.25 * 0.5</gadget>
<output>0.625</output>

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

<gadget id="calculator">1 + 0.625 + 0.4</gadget>
<output>2.025</output>

<gadget id="calculator">2.025 * 2</gadget>
<output>4.05</output>

<result>4.05</result>