What is the net present value of a 7-year project with the following expected cash inflows (in millions) as shown below? Suppose that the project requires an upfront investment of $800 million and no other costs in all other years. Assume the discount rate of 12%.

Year 1=$10

Year 2=$10

Year 3=$10

Year 4=$90

Year 5=$90

Year 6=$90

Year 7=$1000

a. 500 million

b. -169.8 million

c. 630.2 million

d. 1430.2 million