A rectangular cardboard is 50 cm long and 40 cm wide. Cut out a square with a side length of 5 cm at each of its four corners, and then fold it into a rectangular box without a cover. What is the volume of this box?
一块长方形硬纸板长50厘米，宽40厘米，在它的四个角各剪去一个边长为5厘米的正方形，然后折叠成一个无盖的长方体纸盒，这个纸盒的容积是多少？
<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<gadget id="calculator">50 - 10</gadget>
<output>40</output>

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

<gadget id="calculator">40 * 30 * 5</gadget>
<output>6_000</output>

<result>6_000</result>