A batch of parts is inspected, 198 are qualified and 2 are unqualified, what is the failure rate?
检验一批零件，合格的有198个，不合格的2个，不合格率是多少．
<gadget id="calculator">198 + 2</gadget>
<output>200</output>

<gadget id="calculator">2 / 200</gadget>
<output>1/100 = around 0.01</output>

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

<gadget id="calculator">(1/100) * 1</gadget>
<output>1/100 = around 0.01</output>

<result>1/100 = around 0.01</result>