Draw a rectangular piece of land with a length of 200 meters and a width of 100 meters on a plan with a scale of 1:2000. What is the area of the land on the map in square centimeters?
把一块长200米、宽100米的长方形土地画在一张比例尺是1：2000的平面图上，图上这块地的面积是多少平方厘米．
<gadget id="calculator">1 / 2_000</gadget>
<output>1/2_000 = around 0.0005</output>

<gadget id="calculator">200 * 100 * (1/2_000) * 100 * 100 * (1/2_000)</gadget>
<output>50</output>

<result>50</result>