The number of people in a factory has decreased (1/5), but the output has increased by 4%. How much is the current production efficiency higher than before?
某厂人数减少了(1/5)，产量却增加了4%，现在的生产效率比原来提高了多少．
<gadget id="calculator">4 / 100</gadget>
<output>1/25 = around 0.04</output>

<gadget id="calculator">1 + (1/25)</gadget>
<output>26/25 = around 1.04</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">(26/25) / (4/5)</gadget>
<output>13/10 = around 1.3</output>

<gadget id="calculator">(13/10) - 1</gadget>
<output>3/10 = around 0.3</output>

<result>3/10 = around 0.3</result>