20. A project requires an investment in machinery today of $invest million. That investment can be
depreciated for tax purposes straight-line to zero over 5 years. Starting one year from now and ending
4 years from now, the project will generate annual revenues of $rev million and expenses of $ex
million, both pretax. An immediate working capital investment of $wc million is required, and
working capital will remain at that level until recovered 4 years from now. Also at year 4, the
machinery will be sold for $mv million. The firm is taxed at t%. An appropriate discount rate is r%.
What is NPV?
21. You own some equipment that will soon need to be replaced. Whenever you replace it, the new
equipment will cost $cost million and last 12 years, after which time it will have no scrap value. After
that, you expect to buy the same equipment at the same price. There is no inflation. This new
equipment does not require maintenance.
You can replace the old equipment today or after 1 year. If you replace today, the old equipment’s
scrap value will be $sv million and there will be no further maintenance expense. If you wait a year,
scrap value will be 0 and you will incur maintenance expense of $me million, which you can assume is
paid 1 year from now. There are no taxes, and the relevant discount rate is r%. Should you replace now
or later?