What is the after-tax AW, and the annual equivalent EVA?

Consider the proposed capital investment in an engineering project. Proposed capital investment: $85,000 Salvage value (end of year four): 0 Annual expenses per year: $20,000 Gross revenues per year: $50,000 Depreciation method: GDS Property Class year: 3 Effective income tax rate (t): 30% After-tax MARR (i): 13% The study period is 4 years