Master Wang processed a batch of parts and planned to complete the task in 8 days, but actually completed it in 5 days. His work efficiency has increased by a few percent.
王师傅加工一批零件，计划8天完成任务，实际只用5天就完成了，他的工作效率提高了百分之几．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(1/5) - (1/8)</gadget>
<output>3/40 = around 0.075</output>

<gadget id="calculator">(3/40) / (1/8)</gadget>
<output>3/5 = around 0.6</output>

<result>3/5 = around 0.6</result>