The following table gives the patter of investment year rates and portfolio rates over a given period of time. After three years of using investment year rates for a particular year the portfolio interest rate method is applicable on an investment. Frank invests 1000 at the beginning of each calendar years 2005, 2006, 2007, and 2008. What is the average annual effective time-weighted rate of return for this four year period? Give your answer as a percentage rounded to four places (i.e. X.XXXX\%). Do not include the percent sign in BlackBoard. Note: Treat this as a time weighted rate of return problem, but you are looking at the period length as 4 years. Once you get the 4-year rate of return, use that to get the equivalent annual effective interest rate