Two people, A and B, complete the same job, and A takes 80% of the time of B, so how much more efficient is A than B?
甲、乙二人完成同样的工作，甲耗的时间是乙的80%，则甲的工效比乙的工效高多少．
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 * (4/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 / (4/5)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">1 / 1</gadget>
<output>1</output>

<gadget id="calculator">(5/4) - 1</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/4) / 1 / 1</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>