The area of a rectangle is 3200 square meters and the width is 40 meters. If the length and width are increased by 10 meters, how many square meters will its area be increased?
一个长方形的面积是3200平方米，宽是40米，如果长和宽都增加10米，那么它的面积将增加多少平方米？
<gadget id="calculator">3_200 / 40</gadget>
<output>80</output>

<gadget id="calculator">80 + 10</gadget>
<output>90</output>

<gadget id="calculator">40 + 10</gadget>
<output>50</output>

<gadget id="calculator">90 * 50</gadget>
<output>4_500</output>

<gadget id="calculator">4_500 - 3_200</gadget>
<output>1_300</output>

<result>1_300</result>