In a trapezoidal rice field, the upper base is 220 meters long, the lower base is 380 meters long, and the height is 500 meters. This year, a total of 120,000 kilograms of rice will be harvested. How many tons of rice will be harvested per hectare on average?
一块梯形稻田，上底长220米，下底长380米，高500米，今年共收水稻120000千克，平均每公顷收水稻多少吨？
<gadget id="calculator">220 + 380</gadget>
<output>600</output>

<gadget id="calculator">500 / 2 / 10_000</gadget>
<output>1/40 = around 0.025</output>

<gadget id="calculator">600 * (1/40)</gadget>
<output>15</output>

<gadget id="calculator">120_000 / 1_000 / 15</gadget>
<output>8</output>

<result>8</result>