A parallelogram vegetable field has a base of 30 meters and a height of 20 meters. If 12 Chinese cabbages are planted per square meter, how many Chinese cabbages can be planted in this field?
一块平行四边形菜地，底30米，高20米，如果每平方米种12棵大白菜，这块地一共可以种多少棵大白菜？
<gadget id="calculator">30 * 20</gadget>
<output>600</output>

<gadget id="calculator">12 * 600</gadget>
<output>7_200</output>

<result>7_200</result>