A manuscript was originally planned to be copied in 5 days, but it turned out to be finished in 4 days. How much is the actual work efficiency improved compared to the plan?
一份稿件，原计划5天抄完，结果只用4天就抄完了，实际工作效率比计划提高了百分之几？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

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

<gadget id="calculator">(1/4) - (1/5)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(1/20) / (1/5)</gadget>
<output>1/4 = around 0.25</output>

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