A steel ball is submerged in a cuboid container whose length and width are 12 cm and 10 cm respectively, and the water surface rises from the original 7.5 cm to 10 cm (the water does not overflow). Find the volume of the steel ball.
把一个钢球浸没在长、宽分别为12厘米和10厘米的长方体容器里，水面由原来的7.5厘米上升到10厘米(水没有溢出)．求钢球的体积．
<gadget id="calculator">10 - 7.5</gadget>
<output>2.5</output>

<gadget id="calculator">12 * 10 * 2.5</gadget>
<output>300</output>

<result>300</result>