I'd like to show visitors to my website an instant savings based on subtracting 2 attributes costnopromo and cost.
If the attributes are the same, then I do not want to display the text, "Save:"
I know I can do this with an if statement, but I do not know how to subtract the 2 attributes.
How do can achieve the following:
costnopromo - cost = savings_value
NOTE: I've searched and came across the method to show a savings based on MSRP and PRICE but this does not meet my requirements as the costnopromo is a custom value.