I have an Excel 2003 file that has two values for each month regarding sales numbers. I want to take just the first 20 days and get the average of these two columns based on their first "on-sale" date.
I am not sure what to do with it. So, let's say the first on sale date is 4/1/10 and I want the next 20 days of sales from there based on two different columns of sales numbers.
From this date range I would like to average the sales numbers divided by 20.
Help!
Stacy
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