A batch of products, after inspection, 48 pieces are qualified, 2 pieces are unqualified, what is the failure rate
一批产品，经检验，48件合格，2件不合格，不合格率是多少
<gadget id="calculator">2 + 48</gadget>
<output>50</output>

<gadget id="calculator">2 / 50</gadget>
<output>1/25 = around 0.04</output>

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

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

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