$ print ${.sh.version}
Version AJM 93u+ 2012-08-01
$ dc<<<"4k$(printf '3\n3\n'|cut -f1)/100*p"
100.0000
$ print "$(dc<<<"4k$(printf '3\n3\n'|cut -f1)/100*p")"

$ 

afaict these two lines should do the same thing

in earlier versions (e.g. plain 93u) you get an unrecoverable hang instead

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