Beibei Toy Factory produced 2,400 Pleasant Goat toys in August, 400 more than planned. By what percentage?
贝贝玩具厂八月份生产喜羊羊玩具2400个，比计划超产了400个，超产了百分之几？
<gadget id="calculator">2_400 - 400</gadget>
<output>2_000</output>

<gadget id="calculator">400 / 2_000</gadget>
<output>1/5 = around 0.2</output>

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