trapezoidal wheat field has an upper base of 80 meters, a lower base of 120 meters, and a height of 50 meters. If 0.5 kilograms of wheat can be harvested per square meter, how many kilograms of wheat can be harvested in this trapezoidal wheat field?
一块梯形麦田，上底是80米，下底是120米，高50米．如果每平方米可以收小麦0.5千克，这块梯形麦田共收小麦多少千克？
<gadget id="calculator">80 + 120</gadget>
<output>200</output>

<gadget id="calculator">50 / 2</gadget>
<output>25</output>

<gadget id="calculator">200 * 25 * 0.5</gadget>
<output>2_500</output>

<result>2_500</result>