A shop sells orange juice in the following ways: 250 ml bottle for £0.70
1.5 / carton for £2.40 each or 2 cartons for £4.50
21 carton for £3.50
What's the cheapest way of buying exactly 5 litres with no extra?
Find the amount of each type of bottle or carton you need and the
total cost of buying 5 litres.​

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