A piece of trapezoidal iron sheet, the upper base is 3.25 decimeters, the lower base is 8.75 decimeters, and the height is 17 decimeters. If the iron sheet is 4.8 yuan per square meter, how much should you pay for such an iron sheet for 20 yuan?
一块梯形铁皮，上底是3.25分米，下底是8.75分米，高是17分米，如果每平方米铁皮4.8元，买这样的铁皮20块，应付多少钱．
<gadget id="calculator">3.25 + 8.75</gadget>
<output>12</output>

<gadget id="calculator">17 / 2 / 100</gadget>
<output>17/200 = around 0.085</output>

<gadget id="calculator">12 * (17/200) * 4.8 * 20</gadget>
<output>97.92</output>

<result>97.92</result>