A trapezoidal vegetable garden has an upper base of 300 meters, a lower base of 500 meters, and a height of 200 meters. How many hectares does this vegetable garden occupy?
一块梯形菜圃，上底是300米，下底是500米，高是200米，这个菜圃占地多少公顷．
<gadget id="calculator">300 + 500</gadget>
<output>800</output>

<gadget id="calculator">200 / 2 / 10_000</gadget>
<output>1/100 = around 0.01</output>

<gadget id="calculator">800 * (1/100)</gadget>
<output>8</output>

<result>8</result>