I don't understand why the media keep harping on about the wage thing and adding it into the cost.
1. If Mhki was on £150,000/week, over the next 2.5 years we'd pay out £19.5m
2. However, we're swapping him for Sanchez who may be on something like £350,000/week. That extra £200,000 over 2.5 years is £26m.
3. If the contract is 4.5 years, the total cost of wages expenditure for him will be £62.4m more than if Mhki stayed with us for 4.5 years on £150,000/week (which would have been unlikely because he'd likely get a pay rise if we wanted to keep him). (£26m + £36.4m). An extra £15.6m a year...pretty doable for United.
Now where is the extra £120m coming from?
I'm pretty sure there's a huge flaw in my maths, but at this point, I really can't be arsed checking it all over.