This graph shows the cost of buying potatoes from a farm - OCR - GCSE Maths - Question 5 - 2018 - Paper 2

Using the graph, we can find the weight that corresponds to a cost of £38 by tracing horizontally from £38 until we intersect the line, and then vertically down to the weight axis. This indicates that £38 will buy 95kg of potatoes.

The cost per kilogram can be calculated using the graph data. Knowing that 70kg costs £28, we find the cost per kg:

$ext{Cost per kg} = \frac{28}{70} = £0.40$

Now, to find the total cost for 180kg, we multiply:

$ext{Total Cost} = 180 \times 0.40 = £72$