It's not a zero sum game.the math will only make sense if they charge the notebook 1.409…
Otherwise, is a zero sum game.
Let’s see when they ship it!!!
Yesterday you would have paid £1529 for the MBA alone.
Today you paid £1529 for the MBA and a £120 gift card.
Please explain what was lost for you to get the £120 gift card to make it a zero sum game.
In your scenario you are getting a £120 discount that you have just made up as the promotion is clearly stated for a free £120 gift card that you are, by your own admission, getting for no addition cost. You clearly state the price is the same today as yesterday. Plus you'd also be getting the card too, which would be a £240 benefit.