The Life Starter
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Money · Guided lesson

Calculate product contribution

About 14 minutes · 4 reading + 10 practice and checks
Time includes reading, practice, and questions. Extra videos or further study are optional.
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A two-product costing and constrained-capacity model with contribution, overhead, bottleneck minutes and a demand-limited production recommendation.

Keep your working files in your own notebook or software. Save a private description, checklist, and work link in My Proof.

What to include

  • A cost-classification and unit-cost schedule.
  • A contribution schedule and two-product profit bridge.
  • An overhead-rate and applied-versus-actual reconciliation.
  • A capacity feasibility and contribution-per-minute table.
  • A checked feasible product mix with an explicit tie and resource ledger.
  • A price/capacity sensitivity and conditional product-mix recommendation.

Review and revise

Use these criteria to check your work and choose what to improve.

  • Costs: behavior, units and overhead assignment are explicit.
  • Feasibility: time/demand/whole-unit constraints hold.
  • Objective: contribution and fixed-pool profit reconcile.
  • Decision: ties and changed-price/capacity scenarios are checked.
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Before you begin

The idea in everyday life

Original fictional practice. All money is USD. No account, payment, personal record or outside participation is required. Fictional workshop sells whole units only. Product A: price 30, variable material 12, variable labor 6, bottleneck 6 min, demand cap 50. Product B: price 24, material 8, labor 4, bottleneck 4 min, demand cap 80. Available bottleneck time 600 min. Monthly fixed manufacturing overhead 600, budget activity 600 min (rate 1/min). All produced units sell within demand limits; no inventory, other constraints or taxes in this bounded model.

The idea

Contribution covers the fixed pool before it becomes modeled profit.

Follow along

Calculate product contribution — complete worked case

Contribution covers the fixed pool before it becomes modeled profit.

Fictional workshop sells whole units only. Product A: price 30, variable material 12, variable labor 6, bottleneck 6 min, demand cap 50. Product B: price 24, material 8, labor 4, bottleneck 4 min, demand cap 80. Available bottleneck time 600 min. Monthly fixed manufacturing overhead 600, budget activity 600 min (rate 1/min). All produced units sell within demand limits; no inventory, other constraints or taxes in this bounded model.

Two products

Paste at A1.

AProductBPriceCMaterialDVariable laborEMachine minFMax demand
A30126650
B2484480

Copy as plain text

  1. 1. 2.1 Calculate

    Subtract variable unit cost from price for each product.

    You should see: Both products contribute 12/unit.

  2. 2. 2.2 Calculate

    Divide contribution by each own price and label percentages.

    You should see: A40%; B50%.

  3. 3. 2.3 Calculate

    For 40 A/60 B multiply quantity by contribution, sum, then subtract overhead once.

    You should see: Total 1,200; modeled profit 600.

  4. 4. 2.4 Calculate

    Reduce B price to 22; recalculate B contribution 10 and ratio 45.45%, then keep A unchanged.

    You should see: B changed contribution 10; A remains 12.

Now change one thing

A new price is 26 and variable unit cost is 12. Enter unit contribution.

Your work

What to finish

A contribution schedule and two-product profit bridge.

Common mistake

Watch for this

Treating contribution as final profit before fixed costs.

How can I tell I understand it?

Verify that your completed contribution schedule and two-product profit bridge meets the three lesson-specific checks and retains the supporting original records.

Try 3 questions

Quick knowledge check

Answer all 3 questions. Get at least 2 right and the lesson completes automatically.

Not yet passed

You’ll get an explanation for each answer. Signed in? Your results save to your account.

1B price 24 and variable cost 12 gives what contribution ratio?
2100 sold units each contribute 12 and fixed overhead is 600. What modeled profit follows?
3A and B both contribute 12/unit. Why is that insufficient for choosing the bottleneck mix?
0 of 3 answeredApply the lesson to a short question, then review the explanation.
2
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Pass the check. We’ll save the progress.

Answer all 3 questions above and get at least 2 right. You can review the explanations and try again.

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Tools, templates, and lesson sources

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Sources and further reading

Explore the references behind this lesson.

Open Stax: Contribution margin
Source & access notes · checked 2026-10-01

Read cost behavior and unit/total contribution formulas. Original two-product case replaces all published examples.

Access: Public primary page body opened and relevant sections read through the web reader on 2026-10-01; no account required for reading.

Reuse: Original Life Starter cases, datasets and questions; no source exercise or worked dataset reproduced. Links support further reading.

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