problem 4 please and and show all steps

Problem 3 (40%) Water well Initial capital investment = $20,000 One additional investment in year ten = $2,000 One additional investment in year fifteen = $2,000 Net annual savings = $2,250 Salvage value at the end of the life of the well = $1,000 Life of the well = 20 years MARR = 10% Estimate the Present Worth for this project. Is this project economically attractive? Problem 4 (optional 20%) If Problem 3 project is not economically attractive, What should be the life of the well in years to make problem 3 project economically attractive