Make additional operation for two different columns

Question

Hi,

 

I'm really struggling.

 

I make a simple report with three columns:

 

Name, salary, bonus

 

Then to make summaries for salary and bonus columns its fine. See what I do on my rdlc report in c#2015: for column salary is: [Sum(salary)] then for bonus is: [Sum(bonus)].

 

Then I need to add all these columns in one fields. For example, salary + bonus

 

See what I do but it doesn't work: [Sum(salary)] + [Sum(bonus)]

 

Please I need to resolve it. How can I do?

 

Many thanks,

Israel.