A rectangular parallelepiped glass cylinder is 40 cm long and 30 cm wide, and contains water 8 cm deep. After a stone is submerged in the water, the water depth is 12 cm. What is the volume of the stone in cubic centimeters?
一个长方体玻璃缸，长40厘米，宽30厘米，里面盛有8厘米深的水，把一块石头沉没在水中后，水深12厘米，这块石头的体积是多少立方厘米？
<gadget id="calculator">12 - 8</gadget>
<output>4</output>

<gadget id="calculator">40 * 30 * 4</gadget>
<output>4_800</output>

<result>4_800</result>