You have the following information on the performance on an investment fund over 2009: On Jan 1 2009, the fund is worth 100. On July 1 2009, the fund is worth 110 and a withdrawal of 20 is made. On Oct 1 2009, the fund is worth 105 and a deposit of 10 is made. On Dec 31 2009, the fund is worth 120. (a) Find the time-weighted rate of return of this fund over 2009. (b) Find the dollar-weighted rate of return of this fund over 2009.