Put a stone into a rectangular container with a length and width of 12 decimeters and a height of 15 decimeters. The height of the water surface rises from the original 8 decimeters to 10.4 decimeters. Find the volume of the stone?
把一块石头，放入一个长和宽都是12分米、高15分米的长方形容器里，水面的高度由原来的8分米上升到10.4分米，求石头的体积？
<gadget id="calculator">10.4 - 8</gadget>
<output>2.4</output>

<gadget id="calculator">12 * 12 * 2.4</gadget>
<output>345.6</output>

<result>345.6</result>