True or False (if false please explain why)

1) An asset depreciated in the 3-years MACRS class will have book value of 0 at the end of 3 years.

2) The discounted payback period will always be no shorter than the undiscounted payback period.

3) If the internal rate of return on an investment is positive, then the investments net present value must be positive.

4) You are purchasing a machine at $1 million today for a three-year project. At the end of Year 3, you will sell the asset at $800,000. The salvage value will for sure be higher than the market value (of $800,000).

5)If we are comparing two investments, the investment with the higher IRR will have the higher NPV.