A trapezoidal wheat field has an upper base of 200 meters, a lower base of 300 meters, and a height of 200 meters. The harvest per square meter is 12 kilograms. How many tons of wheat can be harvested from this field?
一块梯形的麦田，上底是200米，下底是300米，高是200米，每平方米收获12千克，那么这块地能收获小麦多少吨？
<gadget id="calculator">200 + 300</gadget>
<output>500</output>

<gadget id="calculator">200 / 2</gadget>
<output>100</output>

<gadget id="calculator">12 / 1_000</gadget>
<output>3/250 = around 0.012</output>

<gadget id="calculator">500 * 100 * (3/250)</gadget>
<output>600</output>

<result>600</result>