Xiao Li planned to produce 400 parts, but actually produced 600. What percentage was overfulfilled?
小李计划生产400个零件，实际生产了600个，超额完成了百分之几？
<gadget id="calculator">600 - 400</gadget>
<output>200</output>

<gadget id="calculator">200 / 400</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>