A trapezoidal orchard has an upper base of 2000 meters, a lower base of 5000 meters, and a height of 400 meters. How many hectares does this trapezoidal orchard cover?
一个梯形果园，上底是2000米，下底是5000米，高是400米．这个梯形果园占地多少公顷？
<gadget id="calculator">2_000 + 5_000</gadget>
<output>7_000</output>

<gadget id="calculator">400 / 2 / 10_000</gadget>
<output>1/50 = around 0.02</output>

<gadget id="calculator">7_000 * (1/50)</gadget>
<output>140</output>

<result>140</result>