hi skip,
thank you for catching my error. Here's my question again
For year 1, I would use sumproduct(--c2:c5=2008,a2:a5, b2:b5), for year 2, I would use sumproduct(--c2:c5=2008, a2:a5, b2:b5, b2:b5) but now I need to sum it to the nth year in a formula and seem to figure it out. is it...