Xinfei Building Materials Factory built a new factory building. The original plan was to invest 5 million yuan, but the actual investment was 4.77 million yuan. What percentage was actually reduced from the original plan?
新飞建材厂新建厂房，原计划投资500万，实际投资477万，实际比原计划减少了百分之几？
<gadget id="calculator">500 - 477</gadget>
<output>23</output>

<gadget id="calculator">23 / 500</gadget>
<output>23/500 = around 0.046</output>

<result>23/500 = around 0.046</result>