You open an account where you deposit $500 today. Further, you deposit $800 at the beginning of next year, withdraw $250 at the beginning of year two and deposit $450 at the beginning of year 3. The return for year 1 is 6%, for year 2 it is -8%, for year 3 it is 4.5% and for year 4 it is -2%. What is your dollar-weighted or money-weighted return (in percent) for the four-year period?