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  1. or download this
    $ perl -wMstrict -e 'print "foo %2.2f\% %s\n"'
foo %2.2f% %s
...
foo %2.2f\% %s
$ perl -wMstrict -e 'printf "foo %2.2f\\% %s\n", 40.04, "bar"'
foo 40.04\%s
  2. or download this
    $ perl -wMstrict -e 'print "foo %2.2f%% %s\n"'
foo %2.2f%% %s
$ perl -wMstrict -e 'printf "foo %2.2f%% %s\n", 40.04, "bar"'
foo 40.04% bar