Practice 1–20 assumed sales in sequence using your opening denomination counts. See which sale cannot receive exact change, then revise and rerun. Includes a self-contained desktop-browser tool, fictional example, printable checklist and instructions.

Free download and guide:
https://scope-follow.joe303262000.chatgpt.site/guides/market-day-change-test/

No account or purchase is needed on the guide page. Extract the ZIP before opening the HTML file. JavaScript is required; inputs are not automatically saved. This is a rehearsal, not a payment processor, cash-security recommendation or guarantee that a real day will have enough change.