Answer:
A) $560 million
Explanation:
First lets calculate the NPV of the cash stream by this investment,
PV Cash stream = Cash flow/ (r-g), where r = avg cost of capital and g = growth of the cash stream.
PV = 50 / (0.09 - 0.04) = $1000 million
We assume that external finance issuance costs are payable as a part of initial outlay of the project and so,
Total initial outlay = 420 + 20 = $440 million
NPV of the project then,
NPV = 1000 - 440 = $560 million
Hope that helps.