The Corner Café's expected weekday, hour by hour. Each cup is five customers. Illustrative.
Doors open. The first thirty want coffee and something warm, to go.
Move the sliders. The page builds your week and year, takes the VAT off, checks the lunch ceiling, and re-runs the Chapter 2 rent test.
Dayparts, spends, dwell time and the cold-takeaway share are assumptions in the book, labelled as such. VAT at 20% on eat-in, hot takeaway and always-standard items; cold takeaway food zero-rated (HMRC Notice 709/1). The 12% all-in test is the book's judgement. Nothing here is advice about a particular site. Respects your reduced-motion setting.