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  1. or download this
    perl -le '$Da=406700; $Dp=356400; $Dm=361918; $pct = ($Da - $Dm) / ($D
+a - $Dp); print $pct'
  2. or download this
    perl -Mbignum -le '$Da=406700; $Dp=356400; $Dm=361918; $pct = ($Da - $
+Dm) / ($Da - $Dp); print $pct'
  3. or download this
    perl -Mbignum -MAstro::Units -le '$Da=406700; $Dp=356400; $Dm=361918; 
+$pct = ($Da - $Dm) / ($Da - $Dp); print $pct'
  4. or download this
    perl -MAstro::Units -le '$Da=406700; $Dp=356400; $Dm=361918; $pct = ($
+Da - $Dm) / ($Da - $Dp); print $pct'