Problem 6.8 On January 1, 2005, an investment account is worth $100,000. On June 1, 2005, the value has increased to $105,000 and $10,000 is withdraw. On January 1, 2007, the account is worth $110,650. Assuming a dollar-weighted method for 2005 and a time-weighted method for 2006, the effective annual interest rate was equal to z for both 2005 and 2006. Calculate x