The master and the apprentice process a batch of parts together. The master processed 48 parts, all of which were qualified, and the apprentice processed 32 parts, and 2 were unqualified. What is the pass rate of the batch of parts they processed together?
师傅和徒弟一起加工一批零件，师傅加工了48个，全部合格，徒弟加工了32个，有2个不合格，他们一起加工的这批零件的合格率是多少？
<gadget id="calculator">32 - 2</gadget>
<output>30</output>

<gadget id="calculator">30 + 48</gadget>
<output>78</output>

<gadget id="calculator">48 + 32</gadget>
<output>80</output>

<gadget id="calculator">78 / 80</gadget>
<output>39/40 = around 0.975</output>

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

<gadget id="calculator">(39/40) * 1</gadget>
<output>39/40 = around 0.975</output>

<result>39/40 = around 0.975</result>