Master Zhang plans to produce 16 parts per day, but actually produces 20 parts per day, how much the actual work efficiency has improved compared to the plan
张师傅计划每天生产16个零件，实际每天生产20个零件，实际工作效率比计划提高了多少
<gadget id="calculator">20 - 16</gadget>
<output>4</output>

<gadget id="calculator">4 / 16</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>