Homebrew BRP character sheet question.

I am working on a character sheet for my Basic Roll Playing-based campaign and am trying to mark a skill roll of under 20% of the skill as a critical success.

Currently I am using:

<button type="roll" name="roll_Administration_Roll" value="&{template:default} {{name=@{character_name}}} {{Administration=[[1d100cs<@{Administration}cf>99]] / @{Administration}}}"/>

Which marks any success as a critical.  What I want is something like this:

<button type="roll" name="roll_Administration_Roll" value="&{template:default} {{name=@{character_name}}} {{Administration=[[1d100cs<(@{Administration}/5)cf>99]] / @{Administration}}}"/>

... which doesn't work at all.

Does anyone know how to format this so that a roll under 1/5 of an attribute will be marked as a critical success?

Thanks!

put the calculation for the cs in a nested inline roll ie:
{{Administration=[[1d100cs<[[ @{Administration}/5 ]]cf>99]] / @{Administration}}}

that should force it to calculate the 1/5 administration as you want.

That looks like it would work, but when I tried it, it would always print out "1" for a result.

Critical Success and Fumble Points only accept non-negative integers as arguments, so you'll likely want to add a rounding function to the inline roll. e.g.

{{Administration=[[ 1d100cs<[[floor(@{Administration} / 5)]]cf>99 ]] / @{Administration} }}

Thanks!  That was exactly what I needed.