Calculator not adding items

Hi guys, I have this form that I have cloned, it has a calculator that adds items it works on the original form, but not on this one, I can't figure it out please help, thank you.

You had a plus sign before the open parenthesis and the $ sign being a numeric element which may cause a wrong interpretation on the calculation widget.

I have fixed your form form you. It should now run as expected.

Please let us know if the problem persists.

Thanks.