A shop sells orange juice in the following ways:

500 ml bottle for £1.40
2 litre carton for £2.50 each or 2 cartons for £4.50
3 litre carton for £3.50

What's the cheapest way of buying exactly 7 litres with no extra?
Find the amount of each type of bottle or carton you need and the total cost of buying 7 litres.
500 ml bottle(s): ​
2 litre carton(s):
3 litre carton(s):
Cost: £
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