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ASIGNACION Annual Equivalent (in thousands) Alternative Cost Benefits $1,050 1390 1,500 1,140 1,230 1,350 990 Which plan, if any, should be adopted if the Sewage Authority wishes to invest if, and only if, the B-C ratio is at least 1.0.? (10.9) 10-12. A town in morthern Colorado is planning on investing in a water purification system. Tlhive mutually exclusive systems have been proposed, and their capital investment costs and net annual benefits are the fullowing (salvage values are negligible). System EOY A -$160,000-$245,000-5200,000 0,000 120,00080,000 70,000 100,000 80,000 2 60o 60,00080,000 80,000 50,000 60,000 80,000 If the town's MARR is 10% per year, use the BC ratio method to determine which system is best. (10.9) 10-14. A new storm drainage system must be constructed right away to reduce periodic flooding that occurs in acity that is in a valley. Five mutually exclusive designs have been proposed, and their present worth (in thousands of dollars) of costs and benetits are the fellowing. (10.9) System PW of $1,000 $4,000 $4,000 S10,000 $12,000 PW of 8,000 8,000 14,000 16,000 24,000 benelits a. Which system has the greatest B-C ratio? b. Which system has the largest incremental B-C ratio based on differences between alternatives)? c Which system should be chosen