A stone is placed in a cuboid container with a water depth of 8 decimeters, a bottom length of 5 decimeters, and a width of 4 decimeters. The water level rises by 4 centimeters. What is the volume of the stone?
在一个水深8分米，底面长为5分米，宽为4分米的长方体容器中放入一块石头，水面上升了4厘米，这块石头的体积有多大？
<gadget id="calculator">4 / 10</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">5 * 4 * (2/5)</gadget>
<output>8</output>

<result>8</result>