In Binjiang Park, there is a rectangular lawn with a length of 10 meters and a width of 8 meters. An automatic sprinkler irrigation device with a range of 4 meters is installed in the center of the lawn. What percent of the lawn can be sprayed?
滨江公园里有一块长10米，宽8米的长方形草坪，有一个射程是4米自动喷灌装置安装在草坪的正中心．该草坪有百分之几的面积可以被喷到？
<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">10 * 8</gadget>
<output>80</output>

<gadget id="calculator">16 / 80</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">3.14 * (1/5)</gadget>
<output>0.628</output>

<result>0.628</result>