Two masters and apprentices process a batch of parts, the apprentice processes 120, 20 are unqualified, the master processes 80, and 75 are qualified, find the pass rate of this batch of parts.
师徒二人加工一批零件，徒弟加工120个，有20个不合格，师傅加工80个，合格75个，求这批零件的合格率．
<gadget id="calculator">120 - 20</gadget>
<output>100</output>

<gadget id="calculator">100 + 75</gadget>
<output>175</output>

<gadget id="calculator">120 + 80</gadget>
<output>200</output>

<gadget id="calculator">175 / 200</gadget>
<output>7/8 = around 0.875</output>

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

<gadget id="calculator">(7/8) * 1</gadget>
<output>7/8 = around 0.875</output>

<result>7/8 = around 0.875</result>