Dongshan Village originally planned to afforest 16 hectares last year, but actually afforested 20 hectares. What percentage is the original plan less than the actual afforestation?
东山村去年原计划造林16公顷，实际造林20公顷．原计划比实际造林少百分之几？
<gadget id="calculator">20 - 16</gadget>
<output>4</output>

<gadget id="calculator">4 / 20</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>