The bicycle factory produced 2,500 bicycles in May, an increase of 500 compared to the plan. What percentage was the increase?
自行车厂5月份生产自行车2500辆，比计划增产500辆，增产了百分之几？
<gadget id="calculator">2_500 - 500</gadget>
<output>2_000</output>

<gadget id="calculator">500 / 2_000</gadget>
<output>1/4 = around 0.25</output>

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