To produce a batch of parts, after the innovation, the time is reduced by 20%, but the output is increased by 60%. The work efficiency before the innovation is how much it is after the innovation.
生产一批零件，革新技术后，时间少用20%，产量却增长60%，革新前的工作效率是革新后的多少．
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>