Here is a link to an explanation of sumproduct. I had no idea how to use it
before I read this page:

http://www.xldynamic.com/source/xld.SUMPRODUCT.html

--
Kevin Vaughn


"Paul" wrote:

Bernard, Kevin and Steve - Thank you for your replies. SUMPRODUCT seems to
do exactly what I need. I'll have to research that function further to see
what other applications it may have in my work.

Thanks again.
Paul