There is a trapezoidal rice field in the agricultural park, with an upper base of 80 meters, a lower base of 100 meters, and a height of 60 meters. This year, 11.5 tons of rice can be harvested per hectare. How many tons of rice is expected to be harvested in this paddy field?
农业园区有一块梯形稻田，上底80米，下底100米，高60米．今年每公顷可收稻谷11.5吨，这块稻田预计可收稻谷多少吨？
<gadget id="calculator">80 + 100</gadget>
<output>180</output>

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

<gadget id="calculator">60 / 2 / 10_000</gadget>
<output>3/1_000 = around 0.003</output>

<gadget id="calculator">11.5 * 180 * (3/1_000)</gadget>
<output>6.21</output>

<result>6.21</result>