Your'e right Nicky-j, the amount VAT in an price is calculated by multiplying the total by 3/23, e.g. if an item costs £11.50 the formula is 11.5*3/23 = 1.5, i.e. £1.50 VAT (the formula for 17.5% was 7/47. You can use this on the old price to get the selling price of the item then add the new...