A square orchard, if its side length increases by 100 meters, then the area of the orchard increases by 7 hectares, what is the area of the square orchard in hectares?
一个正方形果园，如果它的边长增加100米，那么果园的面积增加7公顷，这个正方形果园的面积是多少公顷？
<gadget id="calculator">7 * 10_000</gadget>
<output>70_000</output>

<gadget id="calculator">100 * 100</gadget>
<output>10_000</output>

<gadget id="calculator">70_000 - 10_000</gadget>
<output>60_000</output>

<gadget id="calculator">100 + 100</gadget>
<output>200</output>

<gadget id="calculator">60_000 / 200</gadget>
<output>300</output>

<gadget id="calculator">60_000 / 200 / 10_000</gadget>
<output>3/100 = around 0.03</output>

<gadget id="calculator">300 * (3/100)</gadget>
<output>9</output>

<result>9</result>