A similar parallelogram-shaped vegetable field has a base of 60 meters and a height twice that of the base. A total of 1080 tons of cabbage is harvested a year. How many kilograms of cabbage are harvested per square meter on average?
一块近似的平行四边形菜地，底是60米，高是底的2倍，一年共收获1080吨白菜，平均每平方米收多少千克白菜？
<gadget id="calculator">60 * 2</gadget>
<output>120</output>

<gadget id="calculator">60 * 120</gadget>
<output>7_200</output>

<gadget id="calculator">1_000 / 7_200</gadget>
<output>5/36 = around 0.138889</output>

<gadget id="calculator">1_080 * (5/36)</gadget>
<output>150</output>

<result>150</result>