A worker makes 640 parts, randomly checks 100 parts, and 3 are unqualified. According to this calculation, what is the pass rate of the parts made by this worker.
一个工人做了640个零件，抽检100个，有3个不合格，照这样计算，这个工人做的零件的合格率是多少．
<gadget id="calculator">100 - 3</gadget>
<output>97</output>

<gadget id="calculator">97 / 100</gadget>
<output>97/100 = around 0.97</output>

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

<gadget id="calculator">(97/100) * 1</gadget>
<output>97/100 = around 0.97</output>

<result>97/100 = around 0.97</result>