A certain factory produced 3,600 machines in May, which was 600 more than planned. By what percentage?
某厂5月份生产机器3600台，比计划超产600台，超产了百分之几？
<gadget id="calculator">3_600 - 600</gadget>
<output>3_000</output>

<gadget id="calculator">600 / 3_000</gadget>
<output>1/5 = around 0.2</output>

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