Master Zhang processed 500 parts, 100 more than planned, how many percent more than planned?
张师傅加工了500个零件，比计划多100个，实际比计划多百分之几？
<gadget id="calculator">500 - 100</gadget>
<output>400</output>

<gadget id="calculator">100 / 400</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>