The base of a cuboid is a square with a perimeter of 40 cm. If the height of the cuboid is increased by 4 cm, it becomes a cube. What is the surface area of the original cuboid in square centimeters?
一个长方体的底面是一个周长40厘米的正方形，如果将这个长方体的高增加4厘米，它就变成了一个正方体，原来长方体的表面积是多少平方厘米？
<gadget id="calculator">40 / 4</gadget>
<output>10</output>

<gadget id="calculator">10 * 10</gadget>
<output>100</output>

<gadget id="calculator">10 - 4</gadget>
<output>6</output>

<gadget id="calculator">10 * 6 * 4</gadget>
<output>240</output>

<gadget id="calculator">100 + 240</gadget>
<output>340</output>

<result>340</result>