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I recommend reviewing also our user guide on: How-to-perform-calculation-in-the-form
The Calculation formula editor is just like any normal calculation creator.
The formula should be enclosed on parenthesis if there are nested calculation being done.
((1+2) * (3/4))
As you can see on the example this is a nested calculation. So the formula needs to be contained on parenthesis as needed.
Hope this help. Let us know how we can be of further assistance.