Mr. Li typed a manuscript, and the actual completion time was shortened from the planned 10 hours to 8 hours, so how much his actual work efficiency has improved compared to the original plan.
李老师打一份稿件，实际完成的时间由计划的10小时缩短为8小时，则他的实际工作效率比原计划提高了多少．
<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>