A trapezoidal rice field has an upper base of 120 meters, a lower base of 160 meters, and a height of 30 meters. If 0.8 kg of rice is harvested per square meter, how many kilograms of rice are harvested in this paddy field?
一块梯形稻田，其上底是120米，下底是160米，高是30米．如果每平方米收获稻谷0.8千克，这块稻田一共收获稻谷多少千克？
<gadget id="calculator">120 + 160</gadget>
<output>280</output>

<gadget id="calculator">30 / 2</gadget>
<output>15</output>

<gadget id="calculator">280 * 15 * 0.8</gadget>
<output>3_360</output>

<result>3_360</result>