The factory produces 200 parts, and only 4 are unqualified. What is the pass rate of this batch of parts?
工厂生产200个零件，不合格的只有4个，这批零件合格率是多少．
<gadget id="calculator">200 - 4</gadget>
<output>196</output>

<gadget id="calculator">196 / 200</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>