The knitting factory inspected the products and randomly checked some bath towels. There were 491 pieces that passed the test and 9 pieces that failed. What is the pass rate?
针织厂检验产品，抽查了一些浴巾，合格的有491件，不合格的有9件，合格率是多少．
<gadget id="calculator">491 + 9</gadget>
<output>500</output>

<gadget id="calculator">491 / 500</gadget>
<output>491/500 = around 0.982</output>

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

<gadget id="calculator">(491/500) * 1</gadget>
<output>491/500 = around 0.982</output>

<result>491/500 = around 0.982</result>