To make 100 sections of cylindrical ventilation pipes with a bottom diameter of 10cm and a length of 40dm, the iron sheet is 24 yuan per square decimeter. How much is the total cost?
制作100节底面直径10cm，长为40dm的圆柱形通风管，每平方分米铁皮24元，一共需要多少元？
<gadget id="calculator">10 / 10</gadget>
<output>1</output>

<gadget id="calculator">3.14 * 1 * 40 * 100 * 24</gadget>
<output>301_440</output>

<result>301_440</result>