You are considering the following two projects and can only take one. Your cost of capital is 10.6%. The cash flows for the two projects are as follows ($ million):

project a

year 0: -98

year 1: 22

year 2: 30

year 3: 39

year 4: 50

project b

year 0: -98

year 1: 50

year 2: 39

year 3: 30

year 4: 20

a: what is the IRR of each project

b: what is the NPV of each project at your cost of capital

c: at what cost of capital are you indifferent between the two projects

d: what should you do

please answer a-d