Final answer:
To determine which box is the best value for money, compare the price per unit weight for each box. The larger box has a lower price per pound and is the better value for money this week.
Step-by-step explanation:
The best way to determine which box is the best value for money is to calculate the price per unit weight for each box. Let's start by finding the price per unit weight for the smaller box. The weight of the smaller box is £2.50, and the price is £2.80. Therefore, the price per unit weight for the smaller box is £2.80/£2.50 = £1.12 per pound.
Next, let's find the price per unit weight for the larger box. The weight of the larger box is £2.50 x 2 = £5, and the price is £2.80. Therefore, the price per unit weight for the larger box is £2.80/£5 = £0.56 per pound.
Comparing the prices per unit weight, we can see that the larger box is the better value for money this week, as it has a lower price per pound compared to the smaller box.
Therefore the correct answer is B. The larger box.