{"id":"fpa-gross-to-net-revenue-lines","audience":"fpa","category":"finance-work","track":"finance","technique":"format","level":"beginner","title":"Walk from gross sales to net revenue in five lines","free":false,"task":"You're preparing a one-month revenue walk for a store owner. Write a prompt for plain text with exactly five lines starting \"Gross sales:\", \"Discounts:\", \"Returns:\", \"Net revenue:\" and \"Net as % of gross:\". Gross sales means merchandise only; shipping fees billed to customers are not part of it. Net revenue is gross sales minus discounts and returns. Show the math on the last two lines. Under 70 words.","materialLabel":"Source material (attached to your prompt automatically)","material":"OCTOBER 2026 SALES SUMMARY - Harbor Home Goods\n\nMerchandise sales billed: $500,000\nShipping fees billed to customers: $8,000\nCustomer discounts given: $25,000\nReturns and refunds: $15,000\nPromotional free items given away (at cost): $5,000\nSales tax collected and passed on to the state: $32,000\n\nStore context: Harbor Home Goods runs two stores and an online shop. October included a 10-day fall sale with 5% to 15% off selected items. The owner wants a clean number to compare with last October. Free items are tracked as a marketing cost, not as a reduction of sales. The owner will paste the five lines into a monthly update for the bank.\n\nNote: the point-of-sale report shows a total of $540,000 billed, which includes merchandise, shipping and sales tax.","rules":[{"type":"plainText"},{"type":"maxWords","max":70}],"promptHints":[{"label":"Names the five labels","patterns":["gross sales","net revenue","net as"]},{"label":"Defines gross sales","patterns":["merchandise","shipping"]},{"label":"Defines net","patterns":["minus","discounts and returns"]},{"label":"Asks for the math","patterns":["show","math"]},{"label":"Caps length","patterns":["\\d+\\s*words","under \\d+"]}],"mistakes":[{"title":"Starting from the POS total","why":"The AI uses $540,000 and includes shipping and tax.","fix":"Say: \"Gross sales is merchandise only.\"","checks":["r0"]},{"title":"Subtracting the wrong things","why":"The AI deducts free items or sales tax.","fix":"Add: \"Subtract only discounts and returns.\"","checks":["r2"]},{"title":"No visible math","why":"The AI gives totals with no working.","fix":"Add: \"Show the arithmetic on the last two lines.\"","checks":["r1","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":"Define gross and net in your own words, because the report mixes in items that are not revenue.","rubricLabels":["Gross sales is $500,000 (not $508,000 or $540,000) and Discounts is $25,000 and Returns is $15,000","Net revenue shows $500,000 - $25,000 - $15,000 = $460,000","Net as % of gross shows $460,000 / $500,000 = 92%, and the free items, sales tax and shipping are not subtracted anywhere"]}