There is a square orchard covering an area of 1 hectare. If its side length increases by 300 meters, how many hectares does the area of the orchard increase?
有一台占地1公顷的正方形果园，它的边长增加长300米，那么果园的面积增加多少公顷？
<gadget id="calculator">100 + 300</gadget>
<output>400</output>

<gadget id="calculator">400 * 400</gadget>
<output>160_000</output>

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

<gadget id="calculator">160_000 - 10_000</gadget>
<output>150_000</output>

<gadget id="calculator">150_000 / 10_000</gadget>
<output>15</output>

<result>15</result>