Frank invests $1,000 at the beginning of the years 2005, 2006, 2007, and 2008.

Help me find:

a) The amount of interest credited to Frank's account in the calendar year of 2009 (the answer is NOT 409, 421, 434.2)

b) The value of the fund at the end of 2010

c) Average annual effective time-weighted rate of return for the four-year period.

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The following table gives the pattern of investment year rates and portfolio rates over a period of time from 2005 up through 2010. After three years of using investment year rates for a particular year the portfolio interest rate method is applicable on an investment