Weighted Average Help

[mphillips]

In Column F on the attached, I want to get the weighted average of the difference between column D and column E. For example, F4 shows a 3.55% increase YOY. What's the overall weighted average?

Thanks.

[samba_ravi]

=(sum(e4:e20)-sum(d4:d20))/sum(d4:d20)
try this