C15 · Complete neutral exit
Need exactly 12 items for a fictional class activity. Pretend A packs 3 for $9; B packs 4 for $16. 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.
Use your own model, number sentence/strategy, check and useful message. Record actual support.