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Compare purchase quotes after pack sizes, delivery gates and total cost
Turn a net requirement into an order quantity, screen quotes against fixed gates and test a discount without buying unnecessary stock.
For an operations or purchasing beginner. Use the fictional quotes and a calculator; no supplier account or purchasing authority is required.
What you will make
A checked purchase comparison with rounded quantities, qualified offers, total costs and a revision note explaining the chosen order.
- Round demand to a feasible whole-pack order while respecting the minimum.
- Apply delivery and documentation gates before selecting the lowest total cost.
- Compare a threshold discount against a smaller feasible order using the same stated cost boundary.
The exercise contract
All records, policies and outcomes in this course are fictional. The supplied contract determines the expected answers.
- All amounts are fictional cost units. Demand is a net requirement after usable stock; no other reservations or receipts are implied.
- Order quantity is a whole multiple of pack size and at least both demand and MOQ. MOQ is a minimum number of units, not packs.
- Total quoted cost = ordered units × unit price + stated freight. No tax, currency conversion, financing, disposal or storage cost is supplied; do not invent it.
- Unit 2 requires lead_days≤5 and documentation=yes. Screen these gates before choosing the least total cost.
- Unit 3 gives an all-units discount: B costs 6.5 per unit below 40 units and 6 per unit for all units at 40 or more. Compare the smallest feasible order with the threshold order; no value is assigned to excess stock.
Keep net demand, pack size and MOQ in the same units.
1. Convert the requirement into a feasible order
Start with the net requirement rather than the gross request. In this fixture the given demand already accounts for usable stock, so subtracting stock again would under-order. Name the unit of measure and the cutoff before comparing a quote. A supplier’s MOQ and pack size affect how many units can actually be ordered.
Find the larger of demand and MOQ, divide by pack size and round upward to a whole pack count. Multiply back by pack size. Rounding to the nearest pack can leave a shortage; treating MOQ as a pack count can produce a much larger order. Always check the resulting units against both constraints.
Calculate surplus as ordered units minus net demand. It is not automatically waste, but neither is it automatically a benefit. Keep it visible so the next person can assess storage or future use separately. The course’s cost boundary does not supply those values.
Quote comparison begins with the actual payable quantity. Multiply unit price by ordered units, then add freight once. A low headline price is not enough if packaging forces an extra pack. This first calculation becomes the traceable input for the qualification and discount comparisons later.
Try it yourself
Net demand is 23 units. Use the single quote below and report total cost divided by ordered units for the final field.
Pack-constrained quote
| supplier | pack units | moq units | unit price | freight |
|---|---|---|---|---|
| P | 6 | 18 | 7.5 | 12 |
Numbers use the units in each label. Blank answers are incomplete. ID lists can use commas, spaces or semicolons.
Read this exercise’s solution
Order 4 packs/24 units, surplus 1. Goods cost 180 plus freight 12 = 192; 8 per ordered unit. Other cost categories remain unspecified.
Apply the idea
If MOQ rose to 25 units with the same packs, what order quantity would satisfy it?
Separate qualification from a tempting low price.
2. Screen the offers before comparing their costs
A quote can be cheaper and still fail the required delivery or documentation condition. Write the gates before looking for the minimum. Here a lead time of five days or less and documentation=yes are both mandatory. They are fixed exercise inputs, not a legal or product-safety standard.
Round each supplier independently using its own packs and MOQ. Applying one supplier’s order quantity to every offer can erase the real difference in payable units. Retain surplus beside cost so the result is auditable even when the lowest-cost qualified offer also happens to have the least surplus.
Calculate totals for context, but choose only among offers passing both gates. A late quote remains visible as late; a missing-document quote needs a documentation follow-up. Silently deleting either row would make the comparison look more complete than the evidence allows.
The recommendation should state the requirement, the chosen feasible quantity and the reason other offers were not selected. It does not issue a purchase order. A real buyer would still confirm specification, availability and the quote boundary before making a commitment.
Try it yourself
Net demand is 25 units. Apply whole packs/MOQ, lead≤5 and documentation=yes before recommending the least quoted total.
Comparable supplier offers
| supplier | pack units | moq units | unit price | freight | lead days | documentation |
|---|---|---|---|---|---|---|
| A | 10 | 20 | 6 | 20 | 3 | yes |
| B | 5 | 25 | 6.5 | 0 | 4 | yes |
| C | 5 | 25 | 5 | 5 | 7 | yes |
| D | 5 | 25 | 5.8 | 0 | 4 | no |
Numbers use the units in each label. Blank answers are incomplete. ID lists can use commas, spaces or semicolons.
Read this exercise’s solution
Qualified A/B. A orders 30 units, cost 200; B orders 25, cost 162.5. Recommend B subject to normal quote confirmation. C fails lead time; D needs documentation.
Apply the idea
If C’s lead time were unconfirmed instead of seven days, why would that still be a follow-up rather than a confirmed passing gate?
Compare payable totals instead of unit-price labels.
3. Test the discount against the smaller feasible order
The net requirement now changes to 31 units for supplier B. Its pack size is still five and MOQ is still 25. Recalculate the smallest feasible order before applying a discount. Copying the previous 25-unit order would leave a shortage, while jumping straight to the discount threshold could buy more than needed.
The discount is explicitly all-units: every unit costs 6 when the order reaches 40. Below that threshold each costs 6.5. Compare 35 at the regular price with 40 at the discounted price. This is different from a marginal tier where only units above a threshold receive the lower price.
Lower unit price and lower payable total are different objectives. The exercise assigns no financial benefit to unused stock and no future demand. Under that boundary, choose the feasible option with the lower total. If future use mattered, it would need evidence and a stated decision rule rather than an assumed benefit.
Version the comparison because the demand input changed. The revised note should identify the new quantity, surplus, total and reason the threshold offer was not selected. This makes it clear that the decision was revisited rather than silently reusing an old recommendation.
Try it yourself
New net demand=31, B pack=5, MOQ=25, freight=0. B’s all-units price is 6.5 below 40 units and 6 at 40 or more. Compare the smallest feasible order and the 40-unit threshold.
B price schedule
| minimum units | unit price | price applies to |
|---|---|---|
| 25 | 6.5 | all units below 40 |
| 40 | 6 | all units at 40 or more |
Numbers use the units in each label. Blank answers are incomplete. ID lists can use commas, spaces or semicolons.
Read this exercise’s solution
Order 35 units, surplus 4, total 227.5. Ordering 40 gives surplus 9 and costs 240, an extra 12.5. Choose 35 under the stated total-cost boundary.
Apply the idea
What additional evidence would be needed before assigning value to the extra five units in the threshold order?
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Source and scope
Occupational task context comes from the O*NET® 31.0 Database, USDOL/ETA, under CC BY 4.0. View the occupation.
Task 1142 · 08/2025 · Purchase the highest quality merchandise at the lowest possible price and in correct amounts.
Task 1143 · 08/2025 · Prepare purchase orders, solicit bid proposals, and review requisitions for goods and services.
Skill Workbench selected this context and authored the teaching, examples, practice rules, data and feedback. USDOL/ETA has not approved, endorsed or tested these additions. O*NET® is a trademark of USDOL/ETA. Matching the fixed checks does not certify occupational competence.