Four different methods of recovering by-products are taken into the consideration. All methods have an 8-year life. The MARR is 12% per year. If the methods are mutually exclusive, determine which one can be selected using ROR evaluation. Use PW Method. Cashflow Method First Cost Salvage Value Annual Income A -120000 1400 4000 B -100000 1800 6000 -250000 -600 6000 D -260000 700 10000