Solve without using excel. thank you

A commercial 3D printer is purchased for $ 320,000. The salvage value of the printer decreases by 40% each year that it is held. The cost to operate and maintain the machine the first year it is used is $ 14.500; these costs increase by $5,000 each year. What is the optimal replacement interval and minimum EUAC for the printer, assuming a MARR of 12% is used? A commercial 3D printer is purchased for $ 320,000. The salvage value of the printer decreases by 40% each year that it is held. The cost to operate and maintain the machine the first year it is used is $ 14.500; these costs increase by $5,000 each year. What is the optimal replacement interval and minimum EUAC for the printer, assuming a MARR of 12% is used