A trapezoidal wheat field is 180 meters long at the top, 200 meters long at the bottom, and 150 meters high. It produces 3.6 tons of wheat per hectare. What is the total output of this wheat field?
一块梯形麦田，上底长180米，下底长200米，高为150米，每公顷产小麦3.6吨，这块麦田的总产量是多少吨？
<gadget id="calculator">180 + 120</gadget>
<output>300</output>

<gadget id="calculator">1 * 10_000</gadget>
<output>10_000</output>

<gadget id="calculator">150 / 2 / 10_000</gadget>
<output>3/400 = around 0.0075</output>

<gadget id="calculator">3.6 * 300 * (3/400)</gadget>
<output>8.1</output>

<result>8.1</result>