In order to measure the volume of an irregular stone, Maomao first used a measuring cup to measure 800ml of water and poured it into a cylindrical container. The water depth was measured to be 10cm. Then she completely immersed the stone in the water. At this time, the measured water depth was 12cm. Please help Maomao calculate the volume of the stone.
毛毛为了测量一个不规则的石块的体积，她先用量杯量了800ml的水注入一个圆柱形的容器中，测得水深10cm，接着她将石块完全浸入水中，这时测得水深12cm，请你帮毛毛计算出石块的体积．
<gadget id="calculator">800 / 10</gadget>
<output>80</output>

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

<gadget id="calculator">80 * 2</gadget>
<output>160</output>

<result>160</result>