solveit pleasethisis the final answer we need the past solutioni needmodified benefit and cost analysis and The profitability indexi needthe cost analysis and modified benefit and profit 5 years at an average cost of \( \$ 3.91 \) million per mile. The discount rate is \( 4 \% \) per year, and the study period is 30 years. Evaluate the economics of the proposal using \( (a) \) the mod 0 answers