Formula to compute percentage using variable timeframe

I'm working on this spreadsheet:

I need to create a function for measuring the booked appointment (ie, column F, Booked Lead) rate from the last 30 days across all countries.

What's the best way to do this? I can only come up with a formula using constant values but not with variable timeframe. Thanks for any help.


Category: google spreadsheets Time: 2016-07-28 Views: 0

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