A rectangle has a length of 8m and a width of 5m, and the length and width are increased by 2 cm respectively. How much does the area of the rectangle increase?
一个长方形，长8m，宽5m，长和宽分别增加2厘米，这个长方形的面积增加多少？
<gadget id="calculator">802 * 502</gadget>
<output>402_604</output>

<gadget id="calculator">8 * 100 * 5 * 100</gadget>
<output>400_000</output>

<gadget id="calculator">402_604 - 400_000</gadget>
<output>2_604</output>

<result>2_604</result>