There is a trapezoidal field, the upper base is 150 meters, the lower base is 250 meters, and the height is 80 meters. A total of 8120 kg of wheat is harvested. How many kilograms of wheat are harvested on average per hectare?
有一块梯形地地，上底是150米，下底是250米，高是80米，共收小麦8120千克．平均每公顷收小麦多少千克？
<gadget id="calculator">150 + 250</gadget>
<output>400</output>

<gadget id="calculator">80 / 2 / 10_000</gadget>
<output>1/250 = around 0.004</output>

<gadget id="calculator">400 * (1/250)</gadget>
<output>8/5 = around 1.6</output>

<gadget id="calculator">8_120 / (8/5)</gadget>
<output>5_075</output>

<result>5_075</result>