After a manufacturing factory improved its production technology, its production personnel decreased by 1/5, but its output increased by 40%. What is the current production efficiency before the improvement?
某制造厂改进生产技术后，生产人员减少了(1/5)，而产量却增长了40%，现在的生产效率是改进前的多少．
<gadget id="calculator">40 / 100</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">1 / 5</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) / 1</gadget>
<output>7/4 = around 1.75</output>

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