A residential area is square, covering an area of 250,000 square meters. The foundation of each house in the residential area is also square, covering an area of 400 square meters. The distance between adjacent houses is not less than 28 meters. The area outside the houses is green land, roads, and roads. The ratio of area to green area is 1:5. Question: What is the minimum percentage of the green area of the community to the total area?
某小区成正方形，占地25万平方米，小区中每座房屋的地基也是正方形，占地面积400平方米，相邻房屋的间距不少于28米，房屋以外的面积是绿地和道路，道路面积和绿地面积的比是1：5．问：该小区的绿地面积占总面积的百分比至少是多少？
<gadget id="calculator">500 * 500</gadget>
<output>250_000</output>

<gadget id="calculator">10 + 1</gadget>
<output>11</output>

<gadget id="calculator">11 * 11</gadget>
<output>121</output>

<gadget id="calculator">121 * 400</gadget>
<output>48_400</output>

<gadget id="calculator">250_000 - 48_400</gadget>
<output>201_600</output>

<gadget id="calculator">1 + 5</gadget>
<output>6</output>

<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">201_600 * (5/6)</gadget>
<output>168_000</output>

<gadget id="calculator">168_000 / 250_000</gadget>
<output>84/125 = around 0.672</output>

<result>84/125 = around 0.672</result>