Li Hua planned to finish typing a document in 10 hours, but actually finished it in only 8 hours. How much has Li Hua's work efficiency improved?
李华计划10小时打完一份文件，实际只用8小时就打完了．李华的工作效率提高了多少
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/8) - (1/10)</gadget>
<output>1/40 = around 0.025</output>

<gadget id="calculator">(1/40) / (1/10)</gadget>
<output>1/4 = around 0.25</output>

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