If a square nursery covers an area of 4 hectares, if the side length is increased by 100 meters, how many hectares will the area of the nursery increase? (column calculation)
一个占地4公顷的正方形苗圃，边长加长100米，苗圃的面积增加多少公顷？(列式计算)
<gadget id="calculator">200 + 100</gadget>
<output>300</output>

<gadget id="calculator">300 * 300</gadget>
<output>90_000</output>

<gadget id="calculator">4 * 10_000</gadget>
<output>40_000</output>

<gadget id="calculator">90_000 - 40_000</gadget>
<output>50_000</output>

<gadget id="calculator">50_000 / 10_000</gadget>
<output>5</output>

<result>5</result>