A batch of 5,000 parts is processed. After inspection, the pass rate is 98%. How many unqualified parts are there?
加工一批零件共5000个，经检验，合格率为98%，不合格的零件有几个？
<gadget id="calculator">98 / 100</gadget>
<output>49/50 = around 0.98</output>

<gadget id="calculator">1 - (49/50)</gadget>
<output>1/50 = around 0.02</output>

<gadget id="calculator">5_000 * (1/50)</gadget>
<output>100</output>

<result>100</result>