Make 60 cylindrical ventilation pipes with a length of 50 cm and a base radius of 3 cm with iron sheets. If the iron sheet is 30 yuan per square meter, how much will it cost to make these ventilation pipes?
用铁皮做60个长为50厘米、底面半径为3厘米的圆柱形通风管．如果每平方米铁皮30元，做这些通风管需花多少钱？
<gadget id="calculator">3 / 100</gadget>
<output>3/100 = around 0.03</output>

<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">2 * 3.14 * (3/100) * (1/2) * 60 * 30</gadget>
<output>169.56</output>

<result>169.56</result>