project can be completed by A alone in 10 days and B by himself in 8 days. How much slower is A's work efficiency than B's?
一项工程，甲独做10天完成，乙独做8天完成．甲的工作效率比乙慢百分之几？
<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) / (1/8)</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>