40 meters increased by 25% and then decreased by 25%, what is the result in meters?
40米增加25%后再减少25%，结果是多少米？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 + (1/4)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">40 * (5/4) * (3/4)</gadget>
<output>75/2 = around 37.5</output>

<result>75/2 = around 37.5</result>