C16 · After-own staff

Complete neutral brief

Need exactly 24 items for a fictional community display. Pretend A packs 6 for $18; B packs 8 for $32. Whole packs and no extras. Compare full costs for the same quantity. Work out the whole-dollar cost of one item in each offer. Explain how those unit costs help you check the full-cost comparison.

Specific criterion

Compare two whole-pack offers for the same required quantity and explain a whole-dollar unit cost.

One staff worked possibility

A:4 packs/$72. B:3 packs/$96. Both supply 24 items; A costs $24 less. A costs $18 ÷ 6 = $3 per item; B costs $32 ÷ 8 = $4 per item. For 24 items, 24 × $3 = $72 and 24 × $4 = $96, matching the whole-pack totals.

Neutral support limit

Ask one neutral 'What does that amount count?' question if necessary and record it. Teach afterwards rather than covertly supplying the model.

Evidence scope

An individual response in a selected mode. Read/scribe if needed and record support; hide the teacher model first. Formative partial evidence, not an annual grade.