A rectangular garden is 80 meters long and 60 meters wide. If the length is expanded to 4 times the original size, if the width remains the same, what is the area of the garden after the expansion?
一个长方形花园，长80米，宽60米，现在将长扩大到原来的4倍，如果宽不变，那么扩建后花园的面积是多少？
<gadget id="calculator">80 * 60 * 4</gadget>
<output>19_200</output>

<result>19_200</result>