After introducing a new production line in a workshop, the time is reduced by 20%, but the output is increased (2/5), what is the current work efficiency?
一车间引进一条新生产线后，时间少用20%，而产量却增加(2/5)，现在的工作效率是原来多少
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 + (2/5)</gadget>
<output>7/5 = around 1.4</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

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

<gadget id="calculator">(7/5) / (4/5)</gadget>
<output>7/4 = around 1.75</output>

<result>7/4 = around 1.75</result>