Loaf A is 700 g and costs 2.80 dollars. Loaf B is 900 g and costs 3.42 dollars. Both are the same kind and quality of bread. Which evaluation correctly identifies the better buy?

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Loaf A costs 0.40 dollars per 100 g, whereas Loaf B costs 0.38 dollars per 100 g, so Loaf B is the better buy. Choosing Loaf A because 2.80 dollars is lower uses total price and ignores the extra bread in Loaf B.