please show steps

bpage 3) A do-nothing and two mutually exclusive alternatives are being considered for reducing traffic con gestion. User benefits come from reduced congestion once the project is complete, while user disbenefits are due to increased congestion during construction. Consider a yearly interest rate of 10%, and a project life of 15 years for all alternatives. Describe which alternative should be chosen using benefit-cost ratio Alternative B Yearly Benefits (per year) $2,100,000 $2,600,000 Yearly Dis-benefits $1,200,000 $2,100,000 Initial cost $6,900,000 $9,900,000 Yearly cost $750,000 $825,000