You have to decide between two projects. project a has an initial cost of $5,000 and a useful life of 5 years, at which time it can be replace for $5,000. it has a net annual benefit of $2,500. project b has an initial cost of $9,000, a useful life of 10 years, and a net annual benefit of $3,300. which project should you select if you compare costs over a 10-year period? why would you select this project? assume marr = 30%.