In a batch of parts, 496 are qualified and 4 are defective. What is the pass rate of this batch of parts?
一批零件，有496个合格，4个是次品，求这批零件的合格率？
<gadget id="calculator">100 / 100</gadget>
<output>1</output>

<gadget id="calculator">0.99 * 1</gadget>
<output>0.99</output>

<result>0.99</result>