Final answer:
To determine which box is cheaper per gram, calculate the price per gram for each box and compare them. Box B is $0.009 cheaper per gram compared to Box A.
Step-by-step explanation:
To determine which box is cheaper per gram, we need to calculate the price per gram for each box and compare them.
Box A costs $5.25 for 250g, so the price per gram is $5.25/250 = $0.021/g.
Box B costs $4.50 for 375g, so the price per gram is $4.50/375 = $0.012/g.
Therefore, Box B is cheaper per gram by $0.021 - $0.012 = $0.009/g.
Box B is $0.009 cheaper per gram compared to Box A.