Please ignore the answers ive already put, i need help solving all of them

A firm is considering three mutually exclusive alternatives as part of an upgrade to an existing transportation network. At EOY 10, alternative lll would be replaced with another alternative ll/ having the same installed cost and net annual revenues, if MARR is 9% per year, which alternative (if any) should be chosen? Use the incremental RR procedure. $40,000 $30,000 $20,000 $6,400$5,650 $5,250 Installed cost Net annual revenue Salvage value Useful life Calculated IRR 20 years 15.0% 20 years 18.2% 10 years 22.9%