A rectangular piece of iron sheet is 60 cm long and 50 cm wide. Cut off its four corners to make a square with a side length of 10 cm, and make a box without a lid. What is the volume of the box in cubic centimeters?
一块长方形铁皮，长60厘米，宽50厘米，把它的四个角各剪去边长为10厘米的正方形，做成一个无盖的盒子，盒子的容积是多少立方厘米．
<gadget id="calculator">10 * 2</gadget>
<output>20</output>

<gadget id="calculator">60 - 20</gadget>
<output>40</output>

<gadget id="calculator">50 - 20</gadget>
<output>30</output>

<gadget id="calculator">40 * 30 * 10</gadget>
<output>12_000</output>

<result>12_000</result>