Guangming Primary School used to have a rectangular playground, 50 meters long and 38 meters wide. When expanding, the length is increased by 10 meters and the width is increased by 8 meters. How many square meters will the playground area increase after the expansion?
光明小学原来有一个长方形的操场，长50米，宽38米．扩建时，长增加10米，宽增加8米，扩建后操场面积增加了多少平方米？
<gadget id="calculator">50 + 10</gadget>
<output>60</output>

<gadget id="calculator">38 + 8</gadget>
<output>46</output>

<gadget id="calculator">60 * 46</gadget>
<output>2_760</output>

<gadget id="calculator">50 * 38</gadget>
<output>1_900</output>

<gadget id="calculator">2_760 - 1_900</gadget>
<output>860</output>

<result>860</result>