A firm is considering purchasing a machine that costs 73,000. It will be used for six? years, and the salvage value at that time is expected to be zero. The machine will save 34,000 per year in? labor, but it will incur 13,000 in operating and maintenance costs each year. The machine will be depreciated according to? five-year MACRS. The?firm's tax rate is 35?%, and its? after-tax MARR is 15?%. Should the machine be? purchased? The present worth of the project is?