A certain parking lot is a rectangle with a length of 70 meters. After expansion, the length increases by 20 meters. As a result, the area increases by 600 square meters. How many square meters does this parking lot now occupy?
某停车场是个长为70米的长方形，扩建后长增加了20米，结果面积增加了600平方米，现在这个停车场占地多少平方米？
<gadget id="calculator">70 + 20</gadget>
<output>90</output>

<gadget id="calculator">600 / 20</gadget>
<output>30</output>

<gadget id="calculator">90 * 30</gadget>
<output>2_700</output>

<result>2_700</result>