The base of a cuboid is a square with a perimeter of 40 cm and a height of 3 decimeters. Find the surface area of this cuboid?
一个长方体的底面是一个正方形周长是40厘米，高是3分米，求这个长方体的表面积？
<gadget id="calculator">40 / 10</gadget>
<output>4</output>

<gadget id="calculator">4 / 4</gadget>
<output>1</output>

<gadget id="calculator">1 * 1 * 2</gadget>
<output>2</output>

<gadget id="calculator">4 * 3</gadget>
<output>12</output>

<gadget id="calculator">2 + 12</gadget>
<output>14</output>

<result>14</result>