1. The problem asks for the difference in cost between 300 g of potatoes and 300 g of carrots. 2. From the graph, the cost of 300 g of potatoes is approximately $27$ p. 3. The cost of 300 g of carrots is approximately $18$ p. 4. To find the difference, subtract the cost of carrots from the cost of potatoes: $$27 - 18 = 9$$ 5. Therefore, the difference in cost is $9$ pence. The potatoes cost 9 pence more than the carrots for 300 grams.