After reducing the staff of a certain unit by 3 people, there are still 27 people. What percentage is the reduction?
某单位工作人员，精减3人后，还有27人，精减了百分之几？
<gadget id="calculator">3 + 27</gadget>
<output>30</output>

<gadget id="calculator">3 / 30</gadget>
<output>1/10 = around 0.1</output>

<result>1/10 = around 0.1</result>