Sampling inspection of the quality of a factory's products, the result is that 80 pieces are qualified and 20 pieces are unqualified, what is the pass rate of the products of this factory
抽样检查某工厂产品的质量，结果是80件合格，20件不合格，这个厂的产品的合格率是多少
<gadget id="calculator">80 + 20</gadget>
<output>100</output>

<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">100 / 100</gadget>
<output>1</output>

<gadget id="calculator">(4/5) * 1</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>