Uncle Wang cut a 5 cm square from each side of a sheet of iron sheet with a length of 4.5 decimeters and a width of 3 decimeters, and welded it into a cuboid box without a cover. What is the volume of this box in cubic decimeters?
王叔叔把一张长4.5分米、宽3分米的铁皮的四周分别剪去一个边长5厘米的正方形，焊制成一个无盖的长方体盒子．这个盒子的容积是多少立方分米？
<gadget id="calculator">4.5 * 10</gadget>
<output>45</output>

<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<gadget id="calculator">45 - 10</gadget>
<output>35</output>

<gadget id="calculator">3 * 10</gadget>
<output>30</output>

<gadget id="calculator">30 - 10</gadget>
<output>20</output>

<gadget id="calculator">5 / 1_000</gadget>
<output>1/200 = around 0.005</output>

<gadget id="calculator">35 * 20 * (1/200)</gadget>
<output>7/2 = around 3.5</output>

<result>7/2 = around 3.5</result>