A batch of products, after inspection, 485 pieces are qualified and 15 pieces are unqualified. What is the unqualified rate of this batch of products?
一批产品，经检验有485件合格，15件不合格，这批产品不合格率为多少．
<gadget id="calculator">485 + 15</gadget>
<output>500</output>

<gadget id="calculator">15 / 500</gadget>
<output>3/100 = around 0.03</output>

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

<gadget id="calculator">(3/100) * 1</gadget>
<output>3/100 = around 0.03</output>

<result>3/100 = around 0.03</result>