Join for free

Compare options by total cost of ownership

Author: AILesson10 min setupTested with:ChatGPTReviewed: 2026-08-28

Quick answer

Compare purchase choices on a common time horizon with acquisition, operation, maintenance, financing, risk, residual value, and uncertainty. Provide: Options and known costs, Use case and horizon, Comparison and uncertainty rules. Expected result: A formula-driven TCO table, annual cash flow, normalized usage metric, scenario range, break-even point, evidence log, and decision caveats.

1

Add your context

Your text stays in this browser. AILesson Prompts does not send it to a model or server.

2

Your prompt

Unfilled fields remain visible as placeholders, so you can still copy and edit the prompt

Compare the supplied options by total cost of ownership using only the stated use case, formulas, and evidence.

Options and costs:
[options]

Use case and horizon:
[use]

Comparison and uncertainty rules:
[rules]

First verify that options meet non-cost gates and that cost scope, tax, currency, time horizon, usage, replacement, financing, and residual-value timing are comparable. Preserve original values and source dates. Separate one-time acquisition, recurring fixed, usage-variable, scheduled maintenance, expected repair or risk allowance, financing, downtime, exit, and residual value. Do not invent prices, failure rates, energy use, inflation, discount rates, tax benefits, lifespan, resale value, or included service. Show formulas, units, timing, evidence status, and confidence for every component; use unknown rather than zero. Avoid double counting warranty, bundled supplies, deposits, interest, and principal. Produce annual cash flows and undiscounted TCO, plus present value only when an approved discount rule is supplied. Normalize by the relevant output or use unit, calculate break-even where assumptions support it, and test low/base/high scenarios without false precision. Keep financial cost distinct from quality, safety, convenience, environmental impact, and unmet requirements.
Private by defaultPrompt assembly happens locally in your browser. Avoid placing confidential information into any AI service unless your organization allows it.

From input to outcome

A worked example

See how concrete context turns this recipe into a usable result

Actual input

Options and known costs
Compare two office printers, prices dated 20 August, CNY including tax. P1 laser: purchase 3,800, delivery 200, starter toner included rated 1,000 pages, replacement toner 520 rated 3,000 pages, drum 680 rated 12,000 pages, electricity estimate 0.12 kWh/100 pages, annual service 300 from year 2, three-year warranty. P2 ink tank: purchase 2,600, delivery free, starter ink rated 4,000 pages, replacement set 260 rated 6,000 pages, printhead cleaning kit 120/year, electricity 0.03 kWh/100 pages, annual service unknown, two-year warranty. Both duplex and meet required paper/security gates. Energy price 0.80/kWh. Repair after warranty, downtime, disposal and resale are unknown. No financing.
Use case and horizon
Three years, expected 8,000 pages/year, total 24,000, 80% black text but supplied consumable yields are combined estimates. Use rated yields only as comparison assumptions, not guarantees. All costs paid upfront when needed. Do not discount or model tax benefit. Consumables may be purchased fractionally for economic-use TCO and also show package cash purchases. No value is assigned to print quality or speed in TCO; discuss separately. Starter supply is consumed first. P1 drum replacement at 12,000-page intervals means one replacement before 24,000 and whether a second is needed exactly at endpoint must be shown as convention. Base convention: replace once during horizon; no terminal replacement.
Comparison and uncertainty rules
Undiscounted CNY. Low/base/high use 18,000/24,000/30,000 total pages. Assume stated yields scale linearly; flag this weak assumption. P1 service years 2 and 3 =600. P2 annual service remains unknown and excludes any conclusion that it is zero. Cleaning kits three per horizon. Energy formula pages/100 × kWh rate × tariff. Consumable economic cost = replacement unit cost × max(0, pages - starter yield)/yield. Package cash view rounds replacement units up. Break-even may compare known costs only and must state P2 service unknown.

Example output

Three-year TCO, base 24,000 pages

Known economic-use cost: P1 acquisition 4,000; toner 520×(24,000−1,000)/3,000 = 3,986.67; one drum 680; energy 24,000/100×0.12×0.80 = 23.04; service 600. Known TCO = CNY 9,289.71, or 0.387/page. Package cash view needs ceil(23,000/3,000)=8 toners, CNY 4,160, producing cash TCO 9,463.04 under the one-drum convention.

P2 acquisition 2,600; ink 260×(24,000−4,000)/6,000 = 866.67; three cleaning kits 360; energy 24,000/100×0.03×0.80 = 5.76. Known TCO = CNY 3,832.43, or 0.160/page, plus unknown annual service, repair after year 2, downtime and exit costs. Package view needs ceil(20,000/6,000)=4 ink sets, CNY 1,040, giving known cash TCO 4,005.76 plus unknowns.

Annual cash-flow timing cannot be fully fixed because exact print timing and purchase points are not supplied; acquisition is year 1, P1 service 300 in years 2 and 3, and P2 cleaning 120/year. A workbook should trigger packages when cumulative pages exceed starter and prior package yield rather than spread cash evenly.

Known-cost scenarios: at 18,000 pages, P1 economic TCO ≈8,235.62 under one-drum convention and P2 ≈3,569.65 plus unknown service; at 30,000, P1 requires two drums before endpoint and known TCO ≈10,343.80, while P2 ≈4,095.20 plus unknown service. Rated-yield linearity is weak and may differ with coverage and maintenance.

On known formulas P2 is lower throughout positive use; a simple break-even against P1 is not reached. But the decision is not complete: P2 service is unknown, its warranty ends one year earlier, and repair/downtime are unknown for both. The known base TCO gap is about 5,457.28; P2 remains lower only if its additional three-year unknown costs do not exceed that gap relative to P1. Verify service, repair coverage, consumable inclusions and realistic yield before purchase. Compare speed, output quality, support and operational risk outside the TCO table rather than assigning invented money values.

Why this works

  1. 1

    A common horizon and usage unit prevent a lower sticker price from hiding recurring or replacement costs

  2. 2

    Scenario and evidence fields reveal which uncertain assumptions can reverse the comparison

Check the result

  • Do all options meet non-cost gates and use the same horizon, usage, tax, currency, timing, and cost scope?

  • Can every cost, residual value, replacement, risk, and break-even input be traced to a formula and dated evidence?

  • Do annual, total, normalized, scenario, and payer cash-flow views reconcile without unknowns treated as zero?

Use it with confidence

Frequently asked questions

Practical answers about when to use this recipe, what to provide, and where human review still matters

What should I prepare before using “Compare options by total cost of ownership”?

For “Compare options by total cost of ownership,” prepare Options and known costs, Use case and horizon, and Comparison and uncertainty rules. Replace placeholders only with information you can verify. If a detail is unknown, preserve that uncertainty explicitly instead of asking the model to infer it.

When is the “Compare options by total cost of ownership” result not ready to use?

The result is not ready if it does not yet deliver the stated outcome—A formula-driven TCO table, annual cash flow, normalized usage metric, scenario range, break-even point, evidence log, and decision caveats—from the supplied evidence, or if it relies on unresolved assumptions, missing approvals, or invented details. Use the checks as release gates: revise the source inputs or assign a named, authorized reviewer instead of polishing an unsupported output.

Which AI tools have recorded tests for “Compare options by total cost of ownership”?

The published test record for “Compare options by total cost of ownership” lists ChatGPT as of 2026-08-28. This confirms recorded runs, not guaranteed compatibility or identical results in later product versions. For another tool or version, keep every constraint visible and repeat the result checks before use.

More ways to explore

Where this recipe fits

Text promptsShopping & product decisions

Keep the work moving