How To: Use SUMPRODUCT for weighted average cost in Excel

This video shows you how to calculate weighted average cost from a transactional data set using SUMPRODUCT function. It explains things very clearly. If you're working with a very large database transactions the SUMPRODUCT function makes it. It works as text if you do the formatting first and then type the number. We put the number in first and then format as text, then press F2 and ENTER.