The garment factory produces 500 suits per day, which is 100 more suits per day than planned. What percentage is the actual daily production increase compared with the plan?
服装厂每天生产500套西装，比计划每天增产100套，实际比计划每天增产百分之几？
<gadget id="calculator">500 - 100</gadget>
<output>400</output>

<gadget id="calculator">100 / 400</gadget>
<output>1/4 = around 0.25</output>

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