A production team produces 1,600 parts, and 4 parts are unqualified after acceptance. What is the qualified rate of the product?
一个生产小组生产1600个零件，验收后有4个不合格，求产品的合格率？
<gadget id="calculator">1_600 - 4</gadget>
<output>1_596</output>

<gadget id="calculator">1_596 / 1_600</gadget>
<output>399/400 = around 0.9975</output>

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

<gadget id="calculator">(399/400) * 1</gadget>
<output>399/400 = around 0.9975</output>

<result>399/400 = around 0.9975</result>