8. Robbie plans to retire in 20 years and has just established a personal retirement account where the annual return rate is 6%. If Robbie deposits $500 in the retirement account at the end of every month in the coming 20 years, how much money will he have in the retirement account at the time of retirement? (5 points). Whats the monthly amount (at the end of each month) he can withdraw from this retirement account in the 10 years after retirement (Robbie will have a zero balance after the last withdrawal)? (5 points)

Please show all work!