4. (2 pts) A county is looking at building a salt truck loading station. It is estimated to cost $90K. The benefits to the county's population through lost time of driving on icy roads is estimated at $30K/year. Maintenance cost each year is estimated to be $2K. Kids in the area will no longer have an informal soccer field to practice on as the station will be built on that flat piece of ground resulting in $5K in additional sheriff patrols every year (a disbenefit) due to fear of vandalism. The station is expected to have an 18-year life and cost $15K to tear down then (a negative salvage cost). If the interest rate is i%, should the county construct the station using the Conventional B/C ratio