In front of a school dormitory building, there is a rectangular clothes drying area with a length of 30 meters and a width of 20 meters. The length and width of the clothes drying area are now increased by 50 decimeters respectively. How many square meters has the area increased?
某学校宿舍楼前有长30米，宽20米的长方形晾衣场，现晾衣场长和宽各增加50分米，面积增加了多少平方米？
<gadget id="calculator">50 / 10</gadget>
<output>5</output>

<gadget id="calculator">30 + 5</gadget>
<output>35</output>

<gadget id="calculator">20 + 5</gadget>
<output>25</output>

<gadget id="calculator">35 * 25</gadget>
<output>875</output>

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

<gadget id="calculator">875 - 600</gadget>
<output>275</output>

<result>275</result>