A factory has produced a batch of parts, the pass rate is 98%, and 10 of all the products are unqualified, how many parts are there in this batch?
某厂生产了一批零件，合格率是98%，全部产品中有10个不合格，这批零件共有多少个．
<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">10 / (1/50)</gadget>
<output>500</output>

<result>500</result>