In Linyuan Park, there is a small lake in the middle of a rectangular lawn with a length of 80 meters and a width of 40 meters, accounting for about 25% of the total area. How many square meters is the green area around the small lake?
林苑公园一个长80米，宽40米的长方形草坪中间有一个小湖，约占总面积的25%，小湖周围的绿地面积有多少平方米？
<gadget id="calculator">80 * 40</gadget>
<output>3_200</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">3_200 * (3/4)</gadget>
<output>2_400</output>

<result>2_400</result>