Polycorp is considering the purchase of a machine for $600,000.
The salvage value at the end of its three-year life is $100,000.
Annual cash operating revenues are $700,000, $600,000 and $550,000
in years 1, 2 and 3, and cash expenses (before interest) are
$300,000, $250,000 and $200,000 respectively. The machine will be
depreciated for tax purposes using straight-line depreciation of
25% per year. Assume a corporate tax rate of 30% (tax is paid in
the year the income is earned)....