The school playground used to be 80 meters long and 40 meters wide. After the expansion, the length increased by 20 meters and the width doubled. What is the area of the playground after the expansion?
学校操场原来长80米，宽40米，扩建后长增加了20米，宽是原来的2倍，扩建后操场的面积是多少？
<gadget id="calculator">80 + 20</gadget>
<output>100</output>

<gadget id="calculator">40 * 2</gadget>
<output>80</output>

<gadget id="calculator">100 * 80</gadget>
<output>8_000</output>

<result>8_000</result>