Percentage calculation in crystal report

How to get a percentage from the following fields.

I have the followings formula field

{@Customers - Active} = if {arcust.custstat} = "a" then 1  
{@Customers - YTD} = if {arcust.ldate} in yeartodate then 1

I need the percentage of YTD active customers.
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If those are the formulas then you can try

       Sum({@Customers - YTD}) / Sum({@Customers - Active} )  * 100


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