After a factory improved its production technology, its production staff decreased by 20%, while its output increased by 40%. What percentage is the current production efficiency before the improvement?
某厂改进生产技术后，生产人员减少20%，而产量增长了40%，现在的生产效率是改进前的百分之几？
<gadget id="calculator">75 / 100</gadget>
<output>3/4 = around 0.75</output>

<result>3/4 = around 0.75</result>