wawa? 
Just another angle in the “average flat fee” what if they close a couple stores that are smaller where the average is working for you or open new monsters where your average will eat your lunch? I’d invest the day and a tank or two of gas and drive to each one and do a per pane count and estimate time. Don’t sell yourself short, upping the price later is way harder than pricing correctly the first time. Don’t ask how I learned.
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