There is a circular fountain with a diameter of 40m in the central square, and a sidewalk with a width of 4m is built around the fountain. If the material cost per square meter is 50 yuan and the labor cost is 10 yuan, how much is the total cost of repairing this sidewalk?
中心广场有一个直径为40m的圆形喷水池，在这个喷水池周围修一条4m宽的便道．如果每平方米的材料费为50元，人工费10元，修这条便道一共要多少元钱？
<gadget id="calculator">50 + 10</gadget>
<output>60</output>

<gadget id="calculator">40 + 4 + 4</gadget>
<output>48</output>

<gadget id="calculator">48 / 2</gadget>
<output>24</output>

<gadget id="calculator">24 ** 2</gadget>
<output>576</output>

<gadget id="calculator">3.14 * 576</gadget>
<output>1_808.64</output>

<gadget id="calculator">40 / 2</gadget>
<output>20</output>

<gadget id="calculator">20 ** 2</gadget>
<output>400</output>

<gadget id="calculator">3.14 * 400</gadget>
<output>1_256</output>

<gadget id="calculator">1_808.64 - 1_256</gadget>
<output>552.64</output>

<gadget id="calculator">60 * 552.64</gadget>
<output>33_158.4</output>

<result>33_158.4</result>