(2 points) $7950 is invested for 9 years at the following interest rates: 12 = 9% for the first 4 years; 14 = 8% for the next 2 years (following the first 4 years), and 12 = 5.5% for the final 3 years. a) Determine the accumulated value of the investment after 9 years. Answer: $ b) What equivalent nominal rate, j4, was earned over the 9-year period? Answer: %