A chemical fertilizer factory produced 5,000 tons of fertilizer in September, which was 1,000 tons more than the original plan. By what percentage was the excess production?
某化肥厂9月份生产化肥5000吨，比原计划多生产1000吨，比原计划超产百分之几？
<gadget id="calculator">5_000 - 1_000</gadget>
<output>4_000</output>

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

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