Master Wang has processed 180 parts, and the pass rate after inspection is 95%. How many parts are unqualified?
王师傅加工了180个零件，经检验合格率是95%，不合格的有多少个．
<gadget id="calculator">95 / 100</gadget>
<output>19/20 = around 0.95</output>

<gadget id="calculator">1 - (19/20)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">180 * (1/20)</gadget>
<output>9</output>

<result>9</result>