Nick,
Just prefix you parameter with a question mark should do the trick:

salary / ?lc_perc

HTH

>I am trying to create a view that shows a percentage of numerical value. For example:
>
>salary / 4
>
>I have a query parameter call lc_perc
>
>I am using the expression builder in view designer, that will come up with an expression such as:
>
>salary / lc_perc
>
>The problem I am having is I cannot see my lc_perc parameter in the expression builder. I was wondering was a way to get/pass the parameter in the expression builder so that I can create an expression based on that parameter?
>
>Thanks
>Nick Patel