deductive genius
ok lets try again:
taking into account the sell on clause, which as you say is 20% of anything over and above the original fee (thats how they usally work)
so 50mill - 33mill paid = 17 profit, less 20% or 3.4mill leaves 13.6mill profit.
now, if you add in the potenial add ons, thats 5mill, 20% of that is 1mill, so an extra 4mill of profit.
so in total its either 13.6mill profit or 17.6mill profit...
now if they do it on book value, wich i doubt they would, it would mean 33mill divided by the length of contract, i will assume 5 years, which works out to 6.6mill per year amorilisation. We have had him 2 years now, so thats 13.2mill amortilsation. so 33mill original fee, take off amortilisation, leaves 19.8mill.
So if we take that 50mill is the fee, minus "books value" of 19.8, leaves a profit of 30.2mill. less 20% sell on fee of circa 6mill, leaves 24mill profit... and thats before the sell on fee...
shall i go on?