Out of 100 parts, 3% are unqualified. After taking out 25 qualified parts, what percentage are unqualified?
100个零件中，3%是不合格的，取出25个合格的零件后，不合格的目前占了百分之几？
<gadget id="calculator">3 / 100</gadget>
<output>3/100 = around 0.03</output>

<gadget id="calculator">100 - 25</gadget>
<output>75</output>

<gadget id="calculator">(3/100) / 75</gadget>
<output>1/2_500 = around 0.0004</output>

<gadget id="calculator">100 * (1/2_500)</gadget>
<output>1/25 = around 0.04</output>

<result>1/25 = around 0.04</result>