A factory plans to complete a batch of processing tasks in 40 days, but it is actually 8 days ahead of schedule, how much the actual efficiency has been improved.
某厂计划40天完成一批加工任务，实际提前8天，实际效率提高了多少．
<gadget id="calculator">40 - 8</gadget>
<output>32</output>

<gadget id="calculator">1 / 32</gadget>
<output>1/32 = around 0.03125</output>

<gadget id="calculator">1 / 40</gadget>
<output>1/40 = around 0.025</output>

<gadget id="calculator">(1/32) - (1/40)</gadget>
<output>1/160 = around 0.00625</output>

<gadget id="calculator">(1/160) / (1/40)</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>