A parallelogram rice field has a base of 200 meters, a height of 400 meters, and a total of 72 tons of rice harvested. How many tons of rice are harvested per hectare?
一块平行四边形水稻田的底是200米，高是400米，共收水稻72吨．平均每公顷收水稻多少吨？
<gadget id="calculator">400 / 10_000</gadget>
<output>1/25 = around 0.04</output>

<gadget id="calculator">200 * (1/25)</gadget>
<output>8</output>

<gadget id="calculator">72 / 8</gadget>
<output>9</output>

<result>9</result>