3.60 ÷ 12= 0.3
so one can of lemonade is roughly £0.30
6.50 ÷ 20 = 0.325
so one can of lemonade is about £0.32
the package that offers 12 cans for £3.60 is the better pack because each can is only £0.30 which is £0.02 cheaper than the other.
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