Put an irregular stone into a cuboid with a length of 40 cm, a width of 25 cm, and a depth of 20 cm. It is found that the water level rises by 2 cm. Find the volume of the stone.
将一个不规则石头放入一个长40厘米，宽25厘米，深20厘米的长方体中，发现水面上升2厘米，求石头的体积．
<gadget id="calculator">40 * 25 * 2</gadget>
<output>2_000</output>

<result>2_000</result>