Master Wang made 20 parts, and one of them failed. What is the qualified rate of this batch of parts?
王师傅做了20个零件，其中1个不合格，这批零件的合格率是多少．
<gadget id="calculator">20 - 1</gadget>
<output>19</output>

<gadget id="calculator">19 / 20</gadget>
<output>19/20 = around 0.95</output>

<gadget id="calculator">100 / 100</gadget>
<output>1</output>

<gadget id="calculator">(19/20) * 1</gadget>
<output>19/20 = around 0.95</output>

<result>19/20 = around 0.95</result>