A new plant in a factory originally planned to invest 500,000 yuan, but the actual investment was 100,000 yuan less than the original plan. What percentage of the actual investment is equivalent to the original planned investment?
某厂新建厂房，原计划投资50万元，实际比原计划少投资10万元，实际投资相当于原计划投资的百分之几？
<gadget id="calculator">50 - 10</gadget>
<output>40</output>

<gadget id="calculator">40 / 50</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>