A batch of parts, 195 qualified, 4 unqualified. If there are no unqualified products, how many more parts should be produced if the pass rate is to reach 98%?
一批零件，有195个合格，4个不合格．再不出现不合格产品的情况下，如果要使合格率达到98%，要再生产几个零件？
<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">4 / (1/50)</gadget>
<output>200</output>

<gadget id="calculator">200 - 195</gadget>
<output>5</output>

<result>5</result>