A rectangular poster is 20 centimeters long and 4 meters wide. How many square meters is the area?
一幅长方形的宣传画长20厘米、宽4米．面积是多少平方米？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/5) * 4</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>