How to create a SUMIF with ISNUMBER

I am trying to add three separate columns together, but sometimes, one column will have text in it instead of a number. Is there a way to get the formula to exclude anything that's not a number? My brain isn't functioning high enough to come up with something that works lol.

This is my current formula:

=IFERROR(Rate@row + OpEx@row + [E & J]@row, "TBD")


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