The Summer Palace in Beijing covers a total area of about 540 hectares, of which the water area accounts for about 4/5 of the total area. How many hectares is the water area?
北京颐和园占地总面积约540公顷，其中水域面积大约占总面积的(4/5)，水域面积大约是多少公顷？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">540 * (4/5)</gadget>
<output>432</output>

<result>432</result>