9. An investor deposits $10,000 per year for 4 years, with the first deposit made 1 year from the present. One year after the last deposit the investor makes the 1st withdrawal of $10,000. One year later the second withdrawal is 5% small- er than the first payment withdrawn. The third withdrawal one year later is 5% less than the second withdrawal. There are a total of 15 annual with- drawals, each being 5% less than the previous one. a. Find the effective annual IRR being earned on this investment to the nearest percent. If the dollars invested and withdrawn in part (a) are in actual dollars and the inflation rate for the 19-year time span of the investment is 9% per year, what is the inflation-free IRR earned on this investment? b