There is a square lawn with a side length of 500 meters. Now the side length is increased to 700 meters. How many hectares has the area increased?
有一块正方形草地，边长500米，现在把边长增加到700米，面积增加了多少公顷？
<gadget id="calculator">700 * 700</gadget>
<output>490_000</output>

<gadget id="calculator">500 * 500</gadget>
<output>250_000</output>

<gadget id="calculator">490_000 - 250_000</gadget>
<output>240_000</output>

<gadget id="calculator">240_000 / 10_000</gadget>
<output>24</output>

<result>24</result>