For a batch of products, 195 are qualified and 5 are unqualified. What is the unqualified rate of this batch of parts?
一批产品，合格的有195个，不合格的有5个，这批零件不合格率是多少．
<gadget id="calculator">195 + 5</gadget>
<output>200</output>

<gadget id="calculator">5 / 200</gadget>
<output>1/40 = around 0.025</output>

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

<gadget id="calculator">(1/40) * 1</gadget>
<output>1/40 = around 0.025</output>

<result>1/40 = around 0.025</result>