If I save $50 per week from my paycheck into my 401k, starting at the age of 21 and ending at the age of 30 (10 years ~or~ how many periods??? There are 52 weeks in a year), then make no further deposits, when I'm ready to retire at age 65 (35 years later), I will have how much to retire on at that time? Assume an 8% growth rate.