A cylindrical tin bucket without a cover has a bottom area of 8 square decimeters, accounting for 25% of the side area, how many square decimeters of iron sheet are needed to make this bucket.
一个无盖的圆柱形铁皮水桶，底面积是8平方分米，占侧面积的25%，做这个水桶需要铁皮多少平方分米．
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">8 / (1/4)</gadget>
<output>32</output>

<gadget id="calculator">8 + 32</gadget>
<output>40</output>

<result>40</result>