{"id":"fpa-working-days-per-day-revenue-lines","audience":"fpa","category":"finance-work","track":"finance","technique":"context","level":"intermediate","title":"Compare two months of revenue per working day","free":false,"task":"You're explaining a month-over-month revenue drop to the VP of Sales. Write a prompt for plain text with lines starting \"Raw change:\", \"October per day:\", \"November per day:\", \"Per-day change:\" and \"Read:\". Divide by working days from the material. Show the math. The Read line states in one short sentence what the per-day numbers show, as a fact, with no forecast. Under 90 words.","materialLabel":"Source material (attached to your prompt automatically)","material":"MONTHLY REVENUE AND WORKING DAYS\n\nOctober 2026 revenue: $1,100,000. Working days: 22.\nNovember 2026 revenue: $950,000. Working days: 19 (20 weekdays less the Thanksgiving holiday on Nov 26).\n\nThe company invoices on shipped orders only, and the warehouse does not ship on weekends or company holidays.\n\nSales commentary draft: \"November revenue is down 13.6% from October, which is a big miss.\"\n\nThe VP of Sales wants to know whether the drop is a real slowdown or a calendar effect. Do not forecast December. Revenue is net of discounts and returns and ties to the ledger. The October and November figures are final and closed.\n\nBoard plan for reference: the plan assumed flat daily revenue from October to November.","rules":[{"type":"plainText"},{"type":"maxWords","max":90}],"promptHints":[{"label":"Names the five lines","patterns":["raw change","per day","per-day change","read"]},{"label":"Divides by working days","patterns":["working days","divide"]},{"label":"Uses material days","patterns":["19","22"]},{"label":"Bans a forecast","patterns":["no forecast","do not forecast"]},{"label":"Caps length","patterns":["\\d+\\s*words","under \\d+"]}],"mistakes":[{"title":"Comparing raw months only","why":"The AI says revenue fell 13.6% and stops.","fix":"Say: \"Divide each month by its working days.\"","checks":["r0","r1"]},{"title":"Using weekdays","why":"The AI uses 20 for November.","fix":"Add: \"Use the working days in the material (19 for November).\"","checks":["r1"]},{"title":"Forecasting","why":"The AI predicts December.","fix":"Add: \"No forecast; one factual sentence.\"","checks":["r2"]},{"title":"Markdown extras","why":"The AI adds bold labels, headings and a closing note.","fix":"Say: \"Plain text, no bold. Output only the lines asked for.\"","checks":["plainText"]},{"title":"Trusting the AI to count words","why":"AI is bad at counting and runs past word limits.","fix":"Ask for fewer words than the real cap and keep each part short.","checks":["maxWords"]}],"hint":"A calendar can fake a decline. Ask for per-day math with the working-day counts from the material.","rubricLabels":["Raw change shows $950,000 - $1,100,000 = -$150,000 (-13.6%)","October per day shows $1,100,000 / 22 = $50,000 and November per day shows $950,000 / 19 = $50,000","Per-day change shows $0 (0%) and the Read line says in one sentence that the drop matches the fewer working days, with no forecast"]}