The master worker needs to make 15 ventilation pipes. The length of each ventilation pipe is 1.2 meters, and the width and height are 0.8 meters. If the joints are negligible, how much iron sheet is needed?
工人师傅要制作15节通分管，每节通风管的长是1.2米，宽和高是0.8米．如果接头处忽略不计，需要多少铁皮？
<gadget id="calculator">1.2 * 0.8</gadget>
<output>0.96</output>

<gadget id="calculator">0.96 + 0.96</gadget>
<output>1.92</output>

<gadget id="calculator">1.92 * 2 * 15</gadget>
<output>57.6</output>

<result>57.6</result>