A cylindrical container has a base area of 4 cm2 and a height of 3 cm. There is 2.8 centimeters of water in it. This is to put a stone with a volume of 2 cubic centimeters into it. After taking out the iron block, how many centimeters is the water surface high?
一个圆柱体容器，底面积是4平方厘米，圆柱体高3厘米．里面有2.8厘米高的水，这是向里面放入一块体积是2立方厘米的石块，拿出铁块后，水面高多少厘米？
<gadget id="calculator">4 * 2.8</gadget>
<output>11.2</output>

<gadget id="calculator">4 * 3</gadget>
<output>12</output>

<gadget id="calculator">2 - 12</gadget>
<output>-10</output>

<gadget id="calculator">11.2 + (-10)</gadget>
<output>1.2</output>

<gadget id="calculator">1.2 / 4</gadget>
<output>0.3</output>

<gadget id="calculator">2.8 - 0.3</gadget>
<output>2.5</output>

<result>2.5</result>