Two possible routes for a power line are under study. Data for the two alternatives are: Alt. X Around the lake Alt. Y Under the lake Length, km First cost (time 0), per km Maintenance, per km per year Useful life, years Salvage value, per km Yearly power loss, per knm 15 $5000 $200 15 $3000 $500 $25,000 $400 15 $5000 $500 If 7% interest p.a. is used, which alternative is economically desirable based on Present Worth method