The electric vehicle factory actually produced 600 electric vehicles in September, 100 more than planned. What percentage was the actual increase in production compared to the plan?
电动车厂九月份实际生产电动车600辆，比计划多生产100辆，实际比计划增产了百分之几？
<gadget id="calculator">600 - 100</gadget>
<output>500</output>

<gadget id="calculator">100 / 500</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>