Susan Robinson is planning her retirement. She is 30 years old today and would like to have $ 600,000 when she turns 55. She estimates she will earn 8 percent rate of return on her retirement investments over time. She wants to set aside a constant amount of money every year (at the end of the year) to achiever her objective. How much money must she invest at the end of each year? How much would she have invest each year if she waited until the age of 35 in order to reach her objective?