The quality of 50 cartons of milk is randomly checked, and the result is that 1 carton is unqualified. What is the pass rate of this batch of milk?
抽查50箱牛奶的质量，结果有1箱不合格，这批牛奶的合格率是多少．
<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>