Hi, I'm having a lot of trouble with this homework. Can you work through it and explain how its done so that I can check my work?

Alternative 1 Remain in existing Nursing Towers Cost, $ Replace Air Handling Units Every 5 Years 2,000,000 ReRoofNursing Towers Every 10 Years 250,000 Nursing Tower Salvage Value after 25 Years 0% Annual Energy Consumption [Cost] 850,000 Maintenance/Repair Costs/Year 1,250,000 Nursin- Staff Annual Costs 7,776,000 Alternative 2 Renovate Nursing Towers (200,000 square feet] Cost, $ Renovation Construction Cost 50/SF Re-RoofNursing Towers Every 10 Years 250,000 Nursing Tower Salvage Value after 25 Years 0% Annual Energy Consumption {Cost} 750,000 Maintenance/Repair Costs/Year 1,100,000 Nursing Staff Annual Costs 6,480,000 Alternative 3 - Build New Nursing Towers {180,000 SF) Cost. $ New Construction Cost 120/SF Demolish Existing Nursing Towers 50/SF Nursing Tower Salvage Value after 25 Years 50% Annual Energy Consumption [Cost] 650,000 Maintenance/Repair Costs/Year 800,000 Nursin- Staff Annual Costs 5,180,000