A square rice field has a side length of 30 meters, and its side length is increased by 200 decimeters. What is the current area?
一个正方形的水稻田，边长是30米，它的边长都增加200分米，现在的面积是多少？
<gadget id="calculator">200 / 10</gadget>
<output>20</output>

<gadget id="calculator">30 + 20</gadget>
<output>50</output>

<gadget id="calculator">50 * 50</gadget>
<output>2_500</output>

<result>2_500</result>