4 (12 pts) A city is planning to invest in potential projects with the estimated cash flows below. Given that interest rate is 4.880884817% per semiannual, determine which option is preferable if options are mutually exclusive using PW analysis. $-25200 $-4200 Alternative First Cost AOC, per Year Annual Increase in Operating Cost, per Year Salvage Value Life, Years D $-13800 $-2100 $-240 $180 5 $4800 Effective interest rate: il = i) alternative C has life time of infinity ii) Alternative C has 10 years life time