Zhangzhuang Primary School used to have a rectangular playground, 50 meters long and 40 meters wide. When expanding the campus, the length increased by 10 meters and the width increased by 8 meters. How many square meters has the playground area increased from the original?
张庄小学原来有一个长方形的操场，长50米，宽40米．扩建校园时，长增加了10米，宽增加了8米．操场的面积比原来增加了多少平方米？
<gadget id="calculator">50 + 10</gadget>
<output>60</output>

<gadget id="calculator">40 + 8</gadget>
<output>48</output>

<gadget id="calculator">60 * 48</gadget>
<output>2_880</output>

<gadget id="calculator">50 * 40</gadget>
<output>2_000</output>

<gadget id="calculator">2_880 - 2_000</gadget>
<output>880</output>

<result>880</result>