You recently paid $13,500 for an investment that promises to pay $675 at the end of each of the next 6 years, then an additional lump sum payment of $15,500 at the end of the 6th year. What is the expected rate of return on this investment? a. 8.0% b. 10.2% c. 9.5% d. 8.9% e. 7.1%