{"id":"acct-split-invoice-cost-centers","audience":"accounting","category":"finance-work","track":"finance","technique":"verification","level":"intermediate","title":"Split a shared invoice across cost centers to the cent","free":false,"task":"You're allocating one shared vendor invoice. Write a prompt for a markdown table with columns Cost center | Percent | Amount, one row per cost center, then a line starting \"Check:\" showing the three amounts add to the invoice total. Round each amount to the cent. If the rounded amounts don't add to the total, adjust the largest share by the difference and say so in the Check line. No other commentary. Under 80 words. No bullets or numbering.","materialLabel":"Invoice and allocation percentages (attached to your prompt automatically)","material":"SHARED INVOICE ALLOCATION - Nov 2026\n\nVendor: Brightline Telecom, October service\nInvoice total: $1,333.33\nPaid by corporate; expense is allocated to cost centers by agreed share:\n  Sales (cost center 4100): 40%\n  Operations (cost center 4200): 35%\n  Admin (cost center 4300): 25%\n\nNotes: the percentages were agreed in September. Admin asked if they could be moved to 20% going forward; that has not been approved. The invoice includes $33.33 of one-time activation fees, which are treated like the rest of the invoice for this allocation.\nRounding rule: round each allocation to the cent; if the rounded amounts do not sum to the invoice total, adjust the largest share.","rules":[{"type":"maxWords","max":80},{"type":"maxBullets","max":0}],"promptHints":[{"label":"Names the columns","patterns":["cost center.*percent.*amount","columns"]},{"label":"Uses agreed percentages","patterns":["agreed","40%.*35%.*25%"]},{"label":"Gives the rounding rule","patterns":["round.*cent","adjust"]},{"label":"Asks for the check line","patterns":["check:"]},{"label":"Limits output","patterns":["no other commentary","only"]}],"mistakes":[{"title":"Using the proposed 20%","why":"The AI follows Admin's request and splits 40/35/20.","fix":"Say: \"Use the agreed 40/35/25, not the proposed change.\"","checks":["r0"]},{"title":"Rounding drift","why":"The AI rounds loosely and the amounts don't add up.","fix":"Add: \"Round to the cent and adjust the largest share if needed.\"","checks":["r1"]},{"title":"No check","why":"The AI skips the proof that the total ties.","fix":"Add: 'One line \"Check:\" with the addition.'","checks":["r2","maxBullets"]},{"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 line short.","checks":["maxWords"]}],"hint":"A split must add back to the invoice. Name the approved percentages, rounding rule and the check line.","rubricLabels":["The output starts with a markdown table with the exact columns Cost center | Percent | Amount, with rows Sales 40% $533.33, Operations 35% $466.67 and Admin 25% $333.33 (agreed 25% for Admin)","Amounts come from $1,333.33 x 40% = $533.332 (533.33), x 35% = $466.6655 (466.67) and x 25% = $333.3325 (333.33)","The last line starts \"Check:\" and shows $533.33 + $466.67 + $333.33 = $1,333.33 and says no adjustment was needed"]}