If we sold Salah for a lot, say £200mill... We could afford to pay Mbappe's salary for almost two years...
... But I still think the money would be better spent elsewhere. I wouldn't sell Salah to fund Mbappe, if we found a billion beneath a seat cushion... Sure, spend a little of it for Mbappe for a few laughs... But otherwise, I don't want Mbappe. It will wreck the wage structure, it will ruin teammanship, etc.
If by whatever 0.05% chance we have, we sign Mbappe, I'll wish him best of luck at the club... But It's not going to happen, nor should it happen.