There is a cylindrical iron box, the circumference of the bottom surface is 50.24 cm, and the height is 40 cm. How many square centimeters of iron sheet should be used to make a pair of such iron boxes?
有一个圆柱形铁盒，底面周长为50.24厘米，高为40厘米，做一对这样的铁盒，至少要用多少平方厘米铁皮？
<gadget id="calculator">50.24 / 3.14 / 2</gadget>
<output>8</output>

<gadget id="calculator">8 ** 2</gadget>
<output>64</output>

<gadget id="calculator">3.14 * 64 * 2</gadget>
<output>401.92</output>

<gadget id="calculator">50.24 * 40</gadget>
<output>2_009.6</output>

<gadget id="calculator">401.92 + 2_009.6</gadget>
<output>2_411.52</output>

<gadget id="calculator">2_411.52 * 2</gadget>
<output>4_823.04</output>

<result>4_823.04</result>