After a factory improves the production technology, the number of production personnel decreases (1/5), but the production volume increases by 40%, so how much is the production efficiency after the improvement of the technology compared with that before the improvement?
某厂改进生产技术后，生产人员减少(1/5)，而生产量却增加了40%，那么改进技术后的生产效率比改进前提高了多少．
<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)</gadget>
<output>7/4 = around 1.75</output>

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

<gadget id="calculator">(7/4) - 1</gadget>
<output>3/4 = around 0.75</output>

<result>3/4 = around 0.75</result>