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I've created a calculation field called "Total Number of Sessions"

=(NumberOfSessionsAge35+NumberOfSessionsGrade15+NumberOfSessionsGrade68+NumberOfSessionsGrade712)

I'd like to give a discount based on the number of sessions:

=(if TotalNumberOfSessions() > 3 then -TotalPrice*0.10 else if TotalNumberOfSessions() > 1 then -TotalPrice*.05 else 0)

But I get an error message saying:

No applicable method 'TotalNumberOfSessions' exists in type 'Cognito.Forms.FormEntry.Edenacres1.SummerOutdoorsSignUpForm' at character 4

Can anyone help me set up the correct formula?

My form template is at this link: https://www.cognitoforms.com/templates/shared/Edenacres1/SummerOutdoorsSignUpForm

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It looks like you've already figured this out, but for completeness the () are what is causing Cognito Forms to think you are trying to call a method.

The formula will be something like: =TotalNumberOfSessions > 3 ? -TotalPrice*0.10 : TotalNumberOfSessions > 1 ? -TotalPrice*.05 : 0

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