Master Wang used to take 8 days to produce a machine part, but it was completed 3 days ahead of schedule. How much is the work efficiency improved?
王师傅生产一种机器零件，原来要8天，结果提前3天完成，工作效率提高百分之几？
<gadget id="calculator">8 - 3</gadget>
<output>5</output>

<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>