Master Zhang used to take 10 minutes to process a part, but now it takes 8 minutes to process the same part due to the adoption of new technology. How much has the working time been reduced?
张师傅加工一个零件原来需要10分钟，现在由于采用新技术，加工同样一个零件需要8分钟，工作时间减少了百分之几？
<gadget id="calculator">10 - 8</gadget>
<output>2</output>

<gadget id="calculator">2 / 10</gadget>
<output>1/5 = around 0.2</output>

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