4-57. John is a very cost-conscious investor. His rule of thumb is that it costs $250 per year, starting in the first year of vehicle life to maintain an automobile. This expense increases by $250 each year over the life of the car. John is now considering the purchase of a five-year-old car with 40,000 miles on it for $8,000. How much money will John have to set aside now to pay for maintenance (as a lump sum) if he keeps this car for seven years? John’s interest rate is 6% per year. (4.11)