A piece of rectangular land is 8 cm long and 5 cm wide on a drawing with a scale of 1:2500. What is the actual area of the land in hectares?
一块长方形土地在比例尺是1：2500的图纸上，长为8cm，宽为5cm，这块地的实际面积是多少公顷？
<gadget id="calculator">1 / 2_500</gadget>
<output>1/2_500 = around 0.0004</output>

<gadget id="calculator">8 / (1/2_500) / 100</gadget>
<output>200</output>

<gadget id="calculator">5 / (1/2_500) / 100 / 10_000</gadget>
<output>1/80 = around 0.0125</output>

<gadget id="calculator">200 * (1/80)</gadget>
<output>5/2 = around 2.5</output>

<result>5/2 = around 2.5</result>