Master Zhang planned to complete a batch of parts in 10 hours, but he completed all the tasks in 8 hours. How much his work efficiency has improved compared to the plan
张师傅计划10小时完成一批零件，结果8小时就全部完成任务，他的工作效率比计划提高了多少
<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>