The engineering team dug a canal, and actually dug 100 meters a day, which was 20 meters more than planned. How many percent more than planned?
工程队挖一条水渠，实际每天挖100米，实际比计划多挖20米，实际比计划多百分之几？
<gadget id="calculator">100 - 20</gadget>
<output>80</output>

<gadget id="calculator">20 / 80</gadget>
<output>1/4 = around 0.25</output>

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