Can you show me how to get the % of this question without using excel ?

Please if you are going to use excel dont even answer . Chegg already has a lot of answers with excel . thank you !!

Telescope by selling time and userslots to various researchers around the world. Four possible telescopes have been identified in addition to the possibility of not buying a telescope if none are financially attractive. The table below details the characteristics of each telescope. An external rate of return analysis is to be performed using a MARR of 25% T1 T2 T3 T4 Useful Life 10 years 10 years 10 years 20 years First Cost $600,000 $800,000 $470.000 $540,000 Salvage Value $70,000 $130.000 $65,000 $200,000 Annual Revenue $400,000 $600.000 $260.000 $320,000 Noelescope versus T3 Expenses $130,000 $270,000 $70,000 $120.000 Ti ve TA T3 ve T4 No Telescope versus T2 T2 versus T4 Which telescop T1 versus T3 attractive? T3 T2SUS 3 No telescope versus T1 Show the corrip No telescope versus T4 bf return used to reach this decision: Ti versus T2 Comparison 1 MERR 1: 29.8 % Comparison 2: T3 versus T4 ERR 2: 96 Comparison 3 TISST ERR 3: 35.3 % Comparison 4 Ti versus T2 ERR 4 %% Telescope by selling time and userslots to various researchers around the world. Four possible telescopes have been identified in addition to the possibility of not buying a telescope if none are financially attractive. The table below details the characteristics of each telescope. An external rate of return analysis is to be performed using a MARR of 25% T1 T2 T3 T4 Useful Life 10 years 10 years 10 years 20 years First Cost $600,000 $800,000 $470.000 $540,000 Salvage Value $70,000 $130.000 $65,000 $200,000 Annual Revenue $400,000 $600.000 $260.000 $320,000 Noelescope versus T3 Expenses $130,000 $270,000 $70,000 $120.000 Ti ve TA T3 ve T4 No Telescope versus T2 T2 versus T4 Which telescop T1 versus T3 attractive? T3 T2SUS 3 No telescope versus T1 Show the corrip No telescope versus T4 bf return used to reach this decision: Ti versus T2 Comparison 1 MERR 1: 29.8 % Comparison 2: T3 versus T4 ERR 2: 96 Comparison 3 TISST ERR 3: 35.3 % Comparison 4 Ti versus T2 ERR 4 %%