The perimeter of a square is 8,000 meters, and 7 tons of rice are harvested per square kilometer. How many tons of rice are harvested on this land?
一个正方形的周长是8000米，每平方千米收稻谷7吨，这块土地共收稻谷多少吨？
<gadget id="calculator">8_000 / 4</gadget>
<output>2_000</output>

<gadget id="calculator">8_000 / 4 / 1_000_000</gadget>
<output>1/500 = around 0.002</output>

<gadget id="calculator">2_000 * (1/500) * 7</gadget>
<output>28</output>

<result>28</result>