Xiaoxiao planned to finish the homework in 20 minutes, but it actually took 25 minutes to complete it. How many percent did the actual time exceed the original plan?
笑笑打算用20分钟完成作业，实际上用了25分钟才完成，实际所用时间比原计划超出了百分之几？
<gadget id="calculator">25 - 20</gadget>
<output>5</output>

<gadget id="calculator">5 / 20</gadget>
<output>1/4 = around 0.25</output>

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