trapezoidal wheat field has an upper base of 400 meters, a lower base of 560 meters, and a height of 50 meters. A total of 15,600 kilograms of wheat is harvested. How many kilograms of wheat are harvested on average per hectare?
一块梯形小麦地，上底为400米，下底为560米，高是50米，一共收小麦15600千克，平均每公顷收小麦多少千克？
<gadget id="calculator">400 + 560</gadget>
<output>960</output>

<gadget id="calculator">50 / 2 / 10_000</gadget>
<output>1/400 = around 0.0025</output>

<gadget id="calculator">960 * (1/400)</gadget>
<output>12/5 = around 2.4</output>

<gadget id="calculator">15_600 / (12/5)</gadget>
<output>6_500</output>

<result>6_500</result>