6. George newly opened an investment account by depositing 2000 on Jan 1. On Mar 1 , the value of the account has increased to 2400 and an additional deposit of 700 is made. On Oct 1 , the value has decreased to 2800 and 400 is withdrawn. On the following Jan 1, the account balance is 2600 . - Determine the dollar-weighted rate of return for the year. - Determine the time-weighted rate of return for the year