A vegetable field is trapezoidal in shape, its upper base is 140 meters, its lower base is 60 meters, and its height is 80 meters. If the average income per square meter is 5 yuan, how much is the total annual income of this vegetable field?
一块菜地的形状是梯形，它的上底是140米，下底是60米，高是80米．如果每平方米平均收入5元，这块菜地每年共收入多少元？
<gadget id="calculator">140 + 60</gadget>
<output>200</output>

<gadget id="calculator">80 / 2</gadget>
<output>40</output>

<gadget id="calculator">200 * 40 * 5</gadget>
<output>40_000</output>

<result>40_000</result>