A square orchard with a perimeter of 800 meters, if 50 kilograms of chemical fertilizer is applied per hectare, how many kilograms of chemical fertilizer is needed in total?
一块正方形果园，周长是800米，如果每公顷施化肥50千克，一共需要多少千克化肥？
<gadget id="calculator">800 / 4</gadget>
<output>200</output>

<gadget id="calculator">800 / 4 / 10_000</gadget>
<output>1/50 = around 0.02</output>

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

<result>200</result>