Master Li produces a batch of parts, 396 are qualified and 4 are unqualified, find the pass rate of this batch of parts.
李师傅生产一批零件，合格的有396个，不合格的有4个，求这批零件的合格率．
<gadget id="calculator">396 + 4</gadget>
<output>400</output>

<gadget id="calculator">396 / 400</gadget>
<output>99/100 = around 0.99</output>

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

<gadget id="calculator">(99/100) * 1</gadget>
<output>99/100 = around 0.99</output>

<result>99/100 = around 0.99</result>