A certain farm has 20 vegetable plots, all of which are of the same size, and are all rectangular with a length of 100 meters and a width of 50 meters. How many hectares do these vegetable fields occupy?
某农场有20块菜地，这些菜地大小一致，都是长100米，宽50米的长方形．这些菜地占地多少公顷？
<gadget id="calculator">50 / 10_000</gadget>
<output>1/200 = around 0.005</output>

<gadget id="calculator">100 * (1/200) * 20</gadget>
<output>10</output>

<result>10</result>