The length is 12cm measured on the plan view of the rectangular test field with a scale of 1:2000. The width is 4cm, what is the actual area of this test field in hectares?
在比例尺是1：2000的长方形试验田的平面图上量得长12cm．宽4cm，这块试验田的实际面积是多少公倾？
<gadget id="calculator">1 / 2_000</gadget>
<output>1/2_000 = around 0.0005</output>

<gadget id="calculator">12 / (1/2_000) / 100</gadget>
<output>240</output>

<gadget id="calculator">4 / (1/2_000) / 100 / 10_000</gadget>
<output>1/125 = around 0.008</output>

<gadget id="calculator">240 * (1/125)</gadget>
<output>48/25 = around 1.92</output>

<result>48/25 = around 1.92</result>