There is a rectangular iron sheet, 60 cm long and 40 cm wide. Cut off a small square with a side length of 5 cm from the four corners of this iron sheet, and then make a cuboid box without a cover. Find the volume of this cuboid box.
有一块长方形的铁皮，长60厘米，宽40厘米．在这块铁皮的四角剪去边长5厘米的小正方形，然后制成一个无盖的长方体盒子，求这个长方体盒子的体积．
<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<gadget id="calculator">60 - 10</gadget>
<output>50</output>

<gadget id="calculator">40 - 10</gadget>
<output>30</output>

<gadget id="calculator">50 * 30 * 5</gadget>
<output>7_500</output>

<result>7_500</result>