A rectangular vegetable field is 600 meters long and 50 meters wide. If 180 kg of chemical fertilizer is applied per hectare, how much chemical fertilizer is needed?
一块长方形菜地长600米，宽50米，如果每公顷施化肥180千克，共需要多少化肥？
<gadget id="calculator">50 / 10_000</gadget>
<output>1/200 = around 0.005</output>

<gadget id="calculator">600 * (1/200) * 180</gadget>
<output>540</output>

<result>540</result>