A cuboid iron bucket without a cover has a volume of 0.72 cubic meters. Measure 8 decimeters long and 5 decimeters wide from the inside. To make such a metal bucket, how many square decimeters of iron sheet are needed at least?
一个无盖的长方体铁皮水桶容积是0.72立方米．从里面量长8分米，宽5分米，做一只这样的铁皮水桶，至少需铁皮多少平方分米？
<gadget id="calculator">8 * 5</gadget>
<output>40</output>

<gadget id="calculator">1_000 / 8 / 5</gadget>
<output>25</output>

<gadget id="calculator">8 * 0.72 * 25 * 2</gadget>
<output>288</output>

<gadget id="calculator">5 * 0.72 * 25 * 2</gadget>
<output>180</output>

<gadget id="calculator">40 + 288 + 180</gadget>
<output>508</output>

<result>508</result>