IDSMATHS retweetet

Just noticed interesting real life maths in @marksandspencer
There’s a 3 for 2 offer on all single cards. I bought 3 £2, 3 £1.50 & 3 £1.
Instead of costing £4+£3+£2=£9, it did the 3 cheapest free, charging £10.50.
Is this a mistake or are supermarket offers ripping us all off?


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