A parallelogram wheat field, with a base length of 80 meters and a height half of the base, can harvest 6.4 kg of wheat per square meter on average. How many kilograms of wheat can be harvested from this wheat field?
一块平行四边形小麦地，底长80米，高是底的一半，平均每平方米可收小麦6.4千克．这块小麦地可收小麦多少千克？
<gadget id="calculator">80 / 2</gadget>
<output>40</output>

<gadget id="calculator">80 * 40 * 6.4</gadget>
<output>20_480</output>

<result>20_480</result>