The following data are given of two alternatives. For interest of $8\%.$ Determine which alternative is a better by using PW and FW $?$

$\backslash$table$[[,$A$\_(1),$B$],[$Initial cost$,-25000,-15000],[$Annual maintenance,$-2000,-4000],[$Expenses at end of $3^($td $)$ year,,$-3500],[$Salvage value,$3000,],[$Lifetime$,4,6]]$