The quality inspector randomly checks 50 pieces of products, and one of them is unqualified. What is the pass rate of this batch of products?
质量检查员从产品中抽查了50件，其中有1件不合格，这批产品的合格率是多少．
<gadget id="calculator">50 - 1</gadget>
<output>49</output>

<gadget id="calculator">49 / 50</gadget>
<output>49/50 = around 0.98</output>

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

<gadget id="calculator">(49/50) * 1</gadget>
<output>49/50 = around 0.98</output>

<result>49/50 = around 0.98</result>