On a drawing with a scale of 1:100, the length of a rectangular building is measured to be 50cm and the width to be 40cm. What is the actual area of the building in square meters?
在一张比例尺是1：100的图纸上，量得长方形建筑物的长是50cm，宽是40cm．这个建筑物的实际面积是多少㎡．
<gadget id="calculator">1 / 100</gadget>
<output>1/100 = around 0.01</output>

<gadget id="calculator">50 / (1/100) / 100</gadget>
<output>50</output>

<gadget id="calculator">40 / (1/100) / 100</gadget>
<output>40</output>

<gadget id="calculator">50 * 40</gadget>
<output>2_000</output>

<result>2_000</result>