A piece of rectangular land is 8 cm long and 5 cm wide on a drawing with a scale of 1:250. How many hectares is the actual area of the land?
一块长方形土地在比例尺是1：250的图纸上，长为8厘米，宽为5厘米，这块地的实际面积的多少公顷？
<gadget id="calculator">1 / 250</gadget>
<output>1/250 = around 0.004</output>

<gadget id="calculator">8 / (1/250) / 100</gadget>
<output>20</output>

<gadget id="calculator">1 * 10_000</gadget>
<output>10_000</output>

<gadget id="calculator">5 / (1/250) / 100 / 10_000</gadget>
<output>1/800 = around 0.00125</output>

<gadget id="calculator">20 * (1/800)</gadget>
<output>1/40 = around 0.025</output>

<result>1/40 = around 0.025</result>