factory produces a batch of parts. After inspection, 6 parts are unqualified. At least how many parts must be qualified to ensure a pass rate of 98%.
某工厂生产一批零件，经检验已有6个零配件不合格，至少要有多少个合格，才能确保合格率98%．
<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">6 / (1/50)</gadget>
<output>300</output>

<gadget id="calculator">300 - 6</gadget>
<output>294</output>

<result>294</result>