Answer:
B. Brand B, 10 oz. bag for $3.90
Explanation:
The lowest per unit cost of different brands can be calculated using the following formula
Cost per oz=Cost per bag/number of oz in that bag
Brand A Cost per oz=3.60/8=$0.45
Brand B Cost per oz=3.90/10=$0.39
Brand C Cost per oz=6.50/16=$0.406
Brand D Cost per oz=0.59/1=$0.59
So the answer is B. Brand B, 10 oz. bag for $3.90