How can I show the sum of results from several custom formulas?

Continuing the discussion from How do I display the total of several custom formulas?:

I still need help with this. I have a list of borrowed items. Each item in the list uses a custom formula to calculate the late fee. The late fee for each item is displayed individually, but I want to display a total field at the bottom of the screen.

Is there a way to grab the output of each formula and total them, or do I need to create a formula that calculates all the current late fees together?

Someone please help!

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