A cuboid with a base area of 200 square centimeters and a height of 12 centimeters contains water 5 centimeters deep. Now a stone is submerged in water so that the water level rises to 7.5 cm. What is the volume of this stone in cubic centimeters?
有一个底面积是200平方厘米，高是12厘米的长方体，里面盛有5厘米深的水．现在把一块石头浸没在水里，水面上升到7.5厘米．这块石头的体积是多少立方厘米？
<gadget id="calculator">7.5 - 5</gadget>
<output>2.5</output>

<gadget id="calculator">200 * 2.5</gadget>
<output>500</output>

<result>500</result>