A processing workshop processed 500 parts in March, which was 1/4 more than the original plan. How many more parts were processed?
某加工车间三月份加工零件500个，比原计划多加工(1/4)，多加工了多少个零件？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 + (1/4)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">500 / (5/4)</gadget>
<output>400</output>

<gadget id="calculator">500 - 400</gadget>
<output>100</output>

<result>100</result>