At what annual mileage is it cheaper to provide your field representatives with cars rather than paying them $0.55 per mile for the use of their own cars? The costs of furnishing a car are as follows: Purchase price $20,000, Life 4 years, Salvage $3000, Storage $400 per year and Maintenance $0.15 per mile. Determine the mileage for (a) i = 10% and (b) i = 16%.