If 2 & 1/2 pounds of walnuts cost $2.50, how much do walnuts cost per pound?

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If 2 & 1/2 pounds of walnuts cost $2.50, how much do walnuts cost per pound?

Calculate unit cost given that 2 & 1/2 = 2.5:
2.50 per pound / 2.5 pounds = $1 per pound