Plant vegetables on a triangular vegetable field with a base of 100 meters and a height of 80 meters. If 5 kilograms of vegetables can be harvested per square meter, how many kilograms of vegetables can be harvested in this vegetable field?
在一块底是100米，高是80米的三角形菜地上种青菜，如果每平方米可收青菜5千克，这块菜地共可收青菜多少千克？
<gadget id="calculator">80 / 2</gadget>
<output>40</output>

<gadget id="calculator">100 * 40 * 5</gadget>
<output>20_000</output>

<result>20_000</result>