Your father paid $10,000 (CF at t= 0) for an investment that promises to pay $750 at the end of each of the next 5 years, then an additional lump sum payment of $17.750 at the end of the 5th year. What is the expected rate of return on this investment? a. 13.50% b. 18.73% C. 19.1796 d. 18.27% e. 20.42%