Interest on a credit card

Hi everyone

Need some help. A friend loaned me £2600 off his credit card. I’ve since paid that back. But now he is telling me there is still £1200 interest still outstanding. I loaned the money in September and paid the £2600 off his card in February.

Could anyone help and advise if the interest amount is correct. I have no qualms about paying it. It just seems a bit high



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