rectangular playground is 82.5 meters long and 36 meters wide. Now it is expanded, and the length and width are increased by 4 meters. How many square meters is the area increased?
一个长方形的操场长82.5米，宽36米，现在进行扩建，长和宽各增加4米，那么面积增加多少平方米？
<gadget id="calculator">82.5 + 4</gadget>
<output>86.5</output>

<gadget id="calculator">36 + 4</gadget>
<output>40</output>

<gadget id="calculator">86.5 * 40</gadget>
<output>3_460</output>

<gadget id="calculator">82.5 * 36</gadget>
<output>2_970</output>

<gadget id="calculator">3_460 - 2_970</gadget>
<output>490</output>

<result>490</result>