A square paddy field with a side length of 200 meters, if 50 kilograms of chemical fertilizer is applied per hectare, how many kilograms of chemical fertilizer is needed?
一块正方形水稻田，边长200米，如果每公顷施化肥50千克，需要多少千克化肥？
<gadget id="calculator">200 / 10_000</gadget>
<output>1/50 = around 0.02</output>

<gadget id="calculator">200 * (1/50) * 50</gadget>
<output>200</output>

<result>200</result>