A parallelogram vegetable field has a base of 20 meters and a height of 8 meters. 3 kilograms of cabbage can be harvested per square meter, how many kilograms of cabbage can be harvested in this land?
一块平行四边形的菜地，底是20米，高是8米．每平方米收白菜3千克，这块地共能收白菜多少千克？
<gadget id="calculator">20 * 8 * 3</gadget>
<output>480</output>

<result>480</result>