"August 1" Forest Farm has an experimental forest that is 800 meters long and 500 meters wide. How many hectares does this experimental forest have?
"八一"林场有一片长800米，宽500米的实验林，这片实验林有多少公顷？
<gadget id="calculator">800 * 500</gadget>
<output>400_000</output>

<gadget id="calculator">400_000 / 10_000</gadget>
<output>40</output>

<result>40</result>