Family shops along the market roads often know their week by feel. Sunday is loud, Monday is for suppliers, Tuesday is thin, and Friday recovers. When the month is added into one number, Tuesday disappears. The rent is still due for Tuesday. The person who minds the stall still eats.
Arthit's ledger review keeps the weekdays in separate columns for one recent month. It is a small insistence, and it changes the talk. Owners stop saying the shop is fine because Saturday was fine. They can see whether Tuesday covers wages, electricity, and the market fee, or whether Saturday is quietly paying for Tuesday.
Bring the day-book as it is, including the messy weeks. A reconstructed month made of round numbers is less useful than a real week with a crossed-out line. If you pay a cousin in cash and never write it down, say the amount out loud. Unwritten wages are still wages, and they are often the reason the tin at home is light.
We also split what leaves for the household. Many stalls treat the till as a shared purse. That can work, until the school fee and a supplier payment fall on the same morning. The sheet gives the household a line of its own so the stall is not blamed for a fee that was never the stall's.
None of this requires a new way of ringing up sales. It requires one honest month and a second sitting to decide what, if anything, moves. Some owners change nothing except the day they restock. That is a complete result.
If the day-book is still in a notebook by the till, the ledger review is the sitting that fits. Write to the office when you are ready to name a week.