A factory completed the plan (9/20) in the first half of the year, and completed 75% of the plan in the second half of the year. How much was overfulfilled this year?
某厂上半年完成计划的(9/20)，下半年完成计划的75%，今年超额完成多少
<gadget id="calculator">9 / 20</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">75 / 100</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(3/4) - 1</gadget>
<output>-1/4 = around -0.25</output>

<gadget id="calculator">(9/20) + (-1/4)</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>