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I need step by step intructions on how to answer this homework question?

PC Shopping Network may upgrade its modem pool. It last upgraded 2 years ago, when it spent $105 million on equipment with an assumed life of 5 years and an assumed salvage value of $15 million for tax purposes. The firm uses straight-line depreciation. The old equipment can be sold today for $80 million. A new modem pool can be installed today for $180 million. This will have a 3-year life and will be depreciated to zero using straight-line depreciation. The new equipment will enable the firm to increase sales by $26 million per year and decrease operating costs by $13 million per year. At the end of 3 years, the new equipment will be worthless. Assume the firm's tax rate is 35% and the discount rate for projects of this sort is 13%.

a.What is the net cash flow at time 0 if the old equipment is replaced?(Negative amounts should be indicated by a minus sign. Do not round intermediate calculations. Enter your answer in millions rounded to 2 decimal places.)

b.What are the incremental cash flows in years 1, 2, and 3?(Do not round intermediate calculations. Enter your answer in millions rounded to 2 decimal places.)

c.What are the NPV and IRR of the replacement project?(Do not round intermediate calculations. Enter the NPV in millions rounded to 2 decimal places. Enter the IRR as a percent rounded to 2 decimal places.)