After a factory improves the production technology, the number of production personnel decreases (5/13), 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(5/13)，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">5 / 13</gadget>
<output>5/13 = around 0.384615</output>

<gadget id="calculator">1 - (5/13)</gadget>
<output>8/13 = around 0.615385</output>

<gadget id="calculator">(7/5) / (8/13)</gadget>
<output>91/40 = around 2.275</output>

<gadget id="calculator">(91/40) - 1</gadget>
<output>51/40 = around 1.275</output>

<result>51/40 = around 1.275</result>