In the "Green Afforestation" activity, it is planned to invest 16,000 yuan, and the actual investment is 20,000 yuan. What percentage is the planned investment less than the actual?
在"绿色造林"活动中，计划投入1.6万元，实际投入2万元．计划投入比实际少百分之几？
<gadget id="calculator">2 - 1.6</gadget>
<output>0.4</output>

<gadget id="calculator">0.4 / 2</gadget>
<output>0.2</output>

<result>0.2</result>