do it on excel please

4. A city government is considering two types of town-dump sanitary systems. Design A requires an initial outlay of $450,000 with annual operating and maintenance costs of $100,000 for the next 20 years; design B calls for an investment of $550,000 with annual operating and maintenance costs of $80,000 per year for the next 20 years. Fee collections from the residents would be $150,000 per year. The interest rate is 11%, and the salvage value for each system is $100,000. Which of the two systems would you select on the basis of the benefit-cost ratio on incremental investment (BC()