£50m ok ish.
Aubameyang and pulisic are 4th and 3rd record signings involving German sides and are recent at 63m and 64m Euros. So maybe £55m sterling. Will put them up with those.
Only De Bruyne at 75m Euros with Man City Tax and Ousmane Dembeke at 115m euros including Barca Tax, are higher.
So 50-55m English pounds will get him
It'll be less because of his contract. 45 million maximum is my guess. RBL don't want to sell him in-league either, giving us (and other PL clubs) a better chance.