11. As an alternative to the used automobile in Problem 10, the student can purchase a new utility model for $13,600 with a 3-year warranty. First-year maintenance cost is expected to be $50 and the maintenance cost will increase by $50 per year thereafter. Operation costs for this new automobile are expected to be $960 for each year of use and its salvage value decreases by 20% per year. What is the economic advantage of the new automobile without interest; with interest at 10%?