In a trapezoidal rice test field, the upper base is 20 meters, the lower base is 36 meters, and the height is 30 meters. If 2 kg of rice is harvested per square meter, how many kilograms of rice will be harvested in this experimental field?
一块梯形水稻试验田，上底是20米，下底是36米，高是30米，如果每平方米收稻谷2千克，这块试验田约收稻谷多少千克？
<gadget id="calculator">20 + 36</gadget>
<output>56</output>

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

<gadget id="calculator">56 * 15 * 2</gadget>
<output>1_680</output>

<result>1_680</result>