Potatoes cost £9 £9\,£9 for a 12.5 kg bag at a farm shop.
The same type of potatoes cost £1.83 £1.83\,£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.
Hence, calculate how much would be saved when buying 25 kg of potatoes from the better-value shop rather than the other shop.
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