The two highway projects shown below are to be compared using Benefit cost method. Which one, if either, should be build? Use interest rate of 10% per year. Alternative I Alternative II First Cost 5,000,000 - 7,000,000 Annual maintenance cost 70,000 - 60,000 Annual benefits 175,000 - 450,000 Annual disbenefits 30,000 - 35,000 Life: both have infinite life