1MA0 Higher June 2012 Paper 2 Q6

EdexcelHigherOld spec4 marksRatio & Basic Proportion

*6 Potatoes cost £9 for a 12.5 kg bag at a farm shop.
The same type of potatoes cost £1.83 for a 2.5 kg bag at a supermarket.

Where are the potatoes the better value, at the farm shop or at the supermarket?
You must show your working. (4)