rate of $$400,000$ per year. It will be completely written off in three years. If we don$$t replace it now, we will have to replace it in two years. We can sell it now for $$603,000$; in two years, it will probably be worth $$177,000.$ The new machine will save us $$377,000$ per year in operating costs. The tax rate is $21$ percent, and the discount rate is $8$ percent.

a$-1.$ Calculate the EAC for the the old computer and the new computer.

Note: A negative answer should be indicated by a minus sign. Do not round intermediate calculations and round your answers to $2$ decimal places, e$.$g$.,32\mathrm{.}16.$

a$-2.$ What is the NPV of the decision to replace the computer now?

Note: A negative answer should be indicated by a minus sign. Do not round intermediate calculations and round your answer to $2$ decimal places, e$.$g$.,32\mathrm{.}16.$