A square orchard covers an area of 4 hectares. If its sides are extended by 100 m, by how many hectares will the area of the orchard be increased?
一个正方形果园占地4公顷，如果它的各边延长100m，那么果园的面积增加多少公顷？
<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>