defining gross sales and asking for reports

[Aamir V.]

I am dealing with a tenant who is asking for changes in the rent and I want to ask for sales reports in return.  I have seen some other language around a gross sales report but was wondering if anyone here has thoughts.

One specific thing I wonder about is where the "gross sales" definition gets negotiated... like I can imagine there being arguments around coupons/discounts/refunds... and what's a valid source of numbers.

How do y'all think about this?