Eight buildings are built on a piece of land with an area of 0.8 hectares, each building covers an area of 600 square meters, and the rest is used for greening and roads. How many hectares are there in total for greening and road land?
在一块面积是0.8公顷的土地上建了8幢楼房，每幢楼房占地600平方米，其余的用于绿化和道路．绿化和道路用地的面积一共有多少公顷？
<gadget id="calculator">8 / 10_000</gadget>
<output>1/1_250 = around 0.0008</output>

<gadget id="calculator">600 * (1/1_250)</gadget>
<output>12/25 = around 0.48</output>

<gadget id="calculator">0.8 - (12/25)</gadget>
<output>0.32</output>

<result>0.32</result>