The radius of the circular base of a TV tower is 20 meters. Now it is necessary to plant a 5-meter-wide circular lawn around it. If the lawn costs 350 yuan per square meter, how much does it cost to plant this lawn?
一个电视塔的圆形塔底的半径是20米，现在要在它的外围种上5米宽的环形草坪，如果每平方米草坪需要350元，种这块草坪需要多少钱？
<gadget id="calculator">20 + 5</gadget>
<output>25</output>

<gadget id="calculator">25 ** 2</gadget>
<output>625</output>

<gadget id="calculator">3.14 * 625</gadget>
<output>1_962.5</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_962.5 - 1_256</gadget>
<output>706.5</output>

<gadget id="calculator">706.5 * 350</gadget>
<output>247_275</output>

<result>247_275</result>