25 meters increased by 20%, and then decreased by 20%, what is the result?
25米增加20%后，再减少20%，结果是多少．
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">25 * (6/5) * (4/5)</gadget>
<output>24</output>

<result>24</result>