The machine tool factory produced 570 machine tools in the first quarter, which was 90 more than planned. How many percent of the plan was exceeded?
机床厂第一季度生产机床570台，比计划多生产90台，超额完成计划的百分之几？
<gadget id="calculator">570 - 90</gadget>
<output>480</output>

<gadget id="calculator">90 / 480</gadget>
<output>3/16 = around 0.1875</output>

<result>3/16 = around 0.1875</result>