Can you help with this following problem please.

11. Alameda Hospital is expecting its new cancer center to generate the following cash flow:

Intial; (30,000,000,000)

invesment net operating year

1, $6000000 , year

2; $8000000 year

3; $16000000, year

4; $20000000, year

5; $30000000, year

a) Determine the payback for the new cancer center.

b) Determine the net present value using a cost of 15 percent

c) Determine the net present value at a cost of capital of 20 percent and compute the internal rate of return

d) at a 15 percent cost of capital, should the project be accepted? At a 20% cost of capital, should the project be accepted? Explain