A fund began operating on January 1, 2005 and used the investment year method to credit interest in the three calendar years 2005 to 2007. The following table shows the rates that were credited in those three years, and also the rates that would have been credited in subsequent years if the fund had continued to use the investment year method: Investment Year Rates Original Investment Year y 2005 2006 2007 2008 4.2% 5.0% 4.7% 5.2 4.9 5.2 4.8% 4.7 5.1 4.6 5.3 5.5 5.1 5.4 4.8 4.5 On January 1, 2008, it was decided to combine all investment years and use the portfolio method for crediting interest in 2008. The amounts in the fund on January 1, 2008 for each of the investment years 2005 to 2008, inclusive, are equal. X is the portfolio rate to be used for crediting interest in 2008 for all investment years. Calculate X. Select one: a. 4.925% b. 5.20% c. 4.80% d. 4.825% e. 5.125% A fund began operating on January 1, 2005 and used the investment year method to credit interest in the three calendar years 2005 to 2007. The following table shows the rates that were credited in those three years, and also the rates that would have been credited in subsequent years if the fund had continued to use the investment year method: Investment Year Rates Original Investment Year y 2005 2006 2007 2008 4.2% 5.0% 4.7% 5.2 4.9 5.2 4.8% 4.7 5.1 4.6 5.3 5.5 5.1 5.4 4.8 4.5 On January 1, 2008, it was decided to combine all investment years and use the portfolio method for crediting interest in 2008. The amounts in the fund on January 1, 2008 for each of the investment years 2005 to 2008, inclusive, are equal. X is the portfolio rate to be used for crediting interest in 2008 for all investment years. Calculate X. Select one: a. 4.925% b. 5.20% c. 4.80% d. 4.825% e. 5.125%