To produce a toy, the production time of each toy is shortened from the original 10 minutes to 8 minutes, how much the work efficiency is improved
生产一种玩具，生产每个玩具用的时间由原来的10分钟缩短到8分钟，工作效率提高多少
<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>