John arithmetic seems dodgy too here. Assume 52 pints from the keg. At £129 the bar is buying it (excluding VAT I assume) at £2.39 a pint. How it gets to £8 depends how you do the maths. On a straight 65% markup you get £3.94 a pint. Add VAT at 20% and you get £4.73 a pint.
So I don’t get the maths on this at all even if you add markup to VAT.

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