Question 8, with explaining please.

8. A project is being considered by the Tennessee Department of Transportation to replace an aging bridge over the Cumberland River on a state highway. The existing two-lane bridge is expensive to maintain and creates a traffic bottleneck because the state highway is four lanes wide on side of the bridge. The new bridge can be constructed at a cost of three milion dollars and estimated annual maintenance costs are $100,000. The existing bridge has annual mai costs of $185,000. The annual benefit to motorists, needs to be estimated, but is certainly greater than zero. Conduct a benefit-cost analysis using a either due to the removal of the traffic bottleneck Rof8% and a study period of 25 years to determine if the new bridge should be ructed. Document your methodology to estimate the annual benefit. MAR