Use iron sheets to make a cuboid fuel tank with a length of 25cm, a width of 16cm, and a maximum volume of 18L. How many square decimeters of iron sheet is needed to make this fuel tank? (The thickness of the interface and the iron sheet is ignored)
用铁皮做一个长是25cm、宽是16cm，最大容积是18L的长方体油箱．做这个油箱至少需要多少平方分米的铁皮？(接口处和铁皮的厚度忽略不计)
<gadget id="calculator">25 * 16</gadget>
<output>400</output>

<gadget id="calculator">18_000 / 25 / 16</gadget>
<output>45</output>

<gadget id="calculator">25 * 45</gadget>
<output>1_125</output>

<gadget id="calculator">16 * 45</gadget>
<output>720</output>

<gadget id="calculator">400 + 1_125 + 720</gadget>
<output>2_245</output>

<gadget id="calculator">2 / 100</gadget>
<output>1/50 = around 0.02</output>

<gadget id="calculator">2_245 * (1/50)</gadget>
<output>449/10 = around 44.9</output>

<result>449/10 = around 44.9</result>