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

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