If a square playground covers an area of 1 hectare, if the length of each side is increased by 100 meters, what is the area of the playground?
一个占地1公顷的正方形操场，如果边长各增加100米，操场的面积是多少公顷．
<gadget id="calculator">100 + 100</gadget>
<output>200</output>

<gadget id="calculator">1 * 10_000</gadget>
<output>10_000</output>

<gadget id="calculator">200 / 10_000</gadget>
<output>1/50 = around 0.02</output>

<gadget id="calculator">200 * (1/50)</gadget>
<output>4</output>

<result>4</result>