PC Shopping Network may upgrade its modem pool. It last upgraded 2 years ago, when it spent $75 million on equipment with an assumed life of 5 years and assumed salvage value of $10 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 $36 million per year and decrease operating costs by $18 million per year. At the end of 3 years, the new equipment will be worthless. Assume the firm's tax rate is 30% and the discount rate for projects of this sort is 10%.

What is Net cash flow at time 0,

The incremental cash flows in years 1, 2 and 3.

And the NPV and IRR of the replacement project.