Aretrofitted space-heating system is being considered for a small office building. the system can be purchased andinstalled for $120,000, and it will save an estimated 300,000 kilowatt-hours (kwh) of electric power each year over a six-year period. a kilowatt-hour of electricity costs $0.10, and the company uses a marr of 15% per year in its economicevaluations of refurbished systems. the market value of the system will be 58,000 at the end of six years, and additionalannual operating and maintenance expenses are negligible. use the benefit-cost method to make a recommendation.(problem)problematol l bridge across the mississippi river is being considered as a replacement for the current 1-40 bridge linkingtennessee to arkansas. because this bridge, if approved, will become a part of the us. interstate highway system, the b-cratio method must be applied in the evaluation. investment costs of the structure are estimated to be $17,500,000, and$325,000 per year in operating and maintenance costs arc anticipated. in addition, the bridge must be resurfaced everyfifth year of its 30-year projected life at a cost of $1,250,000 per occurrence (no resurfacing cost in year 30). revenuesgenerated from the toll are anticipated to be $2,500,000 in its first year of operation, with a projected annual rate ofincrease of 225% per year due to the anticipated annual increase in traffic across the bridge. assuming zero market(salvage) value forthe bridge at the end of 30 years and a marr of 10% per year, should the toll bridge be constructed?