There are 20 waste products in a batch of products, and the pass rate is 99.8%. How many products are there in this batch?
一批产品中有20个废品，合格率为99.8%，这批产品有多少个．
<gadget id="calculator">99.8 / 100</gadget>
<output>0.998</output>

<gadget id="calculator">1 - 0.998</gadget>
<output>0.002</output>

<gadget id="calculator">20 / 0.002</gadget>
<output>10_000</output>

<result>10_000</result>