8. Gwen continuously deposits a total of 1000 per year in her savings account for a total of 15 years. Starting 16 years from now, Gwen begins to make annual withdrawals of 5000 per year for as long as possible and then make a possibly smaller final withdrawal. The savings account credits interest at an annual effective rate of 8%. (a) How many annual withdrawals can Gwen make? (b) What is the amount of her final withdrawal