Four identical yogurt cups cost 3.20 dollars, while six cost 4.50 dollars. Which conclusion shows the best-buy error?

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The four-pack costs 0.80 dollars per cup and the six-pack costs 0.75 dollars per cup, so the six-pack is better value. Calling the four-pack better solely because 3.20 dollars is lower confuses a lower total price with a lower unit price.