A square piece of land has an area of 1 hectare. If the side length is increased by 200 meters, how many hectares will the area increase?
一块正方形的土地，面积是1公顷，如果边长增加200米，面积增加了多少公顷？
<gadget id="calculator">100 + 200</gadget>
<output>300</output>

<gadget id="calculator">300 / 10_000</gadget>
<output>3/100 = around 0.03</output>

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

<gadget id="calculator">9 - 1</gadget>
<output>8</output>

<result>8</result>