There were 120 staff members in a certain agency, and now there are 90 staff members. Simplified by a few percent?
某机关原有工作人员120人，现有90人．精简了百分之几？
<gadget id="calculator">120 - 90</gadget>
<output>30</output>

<gadget id="calculator">30 / 120</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>