The master and apprentice cooperated to produce 5,000 parts, and the apprentice made 2,000 parts, with a pass rate of 95%, and all the parts made by the master were qualified. Seek the pass rate of this batch of parts made by the master and the apprentice.
师徒两人合作5000个零件，徒弟做了2000个零件，合格率达95%，师傅做的零件全部合格．求师徒两人做的这批零件的合格率．
<gadget id="calculator">95 / 100</gadget>
<output>19/20 = around 0.95</output>

<gadget id="calculator">1 - (19/20)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">2_000 * (1/20)</gadget>
<output>100</output>

<gadget id="calculator">5_000 - 100</gadget>
<output>4_900</output>

<gadget id="calculator">4_900 / 5_000</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>