The National Center for Disease Control and Prevention planned to produce a batch of vaccines. The original plan was to complete in 5 days, but it took only 4 days. How much more efficient was the plan?
国家疾病预防中心计划生产一批疫苗，原计划5天完成，结果只用了4天，效率比原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>