A garment factory produced 2,400 sets of garments in the first quarter, which was 400 sets more than planned. What percentage was the overproduction?
某服装厂第一季度生产2400套服装，比计划多生产400套，超产百分之几？
<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>