A factory originally planned to complete the work in 9 hours, but it was completed in 8 hours. How much their work efficiency has improved compared to the original.
某工厂原计划9小时完成的工作，8小时全部完成了，他们的工作效率比原来提高了多少．
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">(1/8) - (1/9)</gadget>
<output>1/72 = around 0.013889</output>

<gadget id="calculator">(1/72) / (1/9)</gadget>
<output>1/8 = around 0.125</output>

<result>1/8 = around 0.125</result>