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s/(\S+)%/$1*0.01/eg #e = evaluate right-side as expression, g = global +, i.e. change all percent-values found, not just the first
map{$a=1-$_/10;map{$d=$a;$e=$b=$_/20-2;map{($d,$e)=(2*$d*$e+$a,$e**2 -$d**2+$b);$c=$d**2+$e**2>4?$d=8:_}1..50;print$c}0..59;print$/}0..20