A rectangular stadium is 500 meters long and 400 meters wide. How many hectares does this stadium occupy?
一个长方形体育场，它的长是500米，宽400米．这个体育场占多少公顷？
<gadget id="calculator">500 * 400</gadget>
<output>200_000</output>

<gadget id="calculator">200_000 / 10_000</gadget>
<output>20</output>

<result>20</result>