Answer: 
1. Sunk costs : $3.2 billion is a sunk cost as it is already incurred. 
2. Opportunity costs: $352 million investment for finishing project is an Opportunity cost. However it will yield $15.1 million per annum for next 5 Yrs. 
So Present Value of this CF is less than $15.1 
 5=$75.5 million.
 5=$75.5 million.
So Net Present Value = CF0 + CF1 + ......+ CF5 = -352 + Less than 75 = Negative. 
So another Opportunity of selling the Satellite for $460 million is a better option. 
3. Specify the relevant cash flows. 
If additional $352 million investment is undertaken,
$352 million will be Cash outflow in Y(0). It will result in Annual CF of $15.1 million for next 5 yrs.