Finance questions: Fundamental. I would like to know the answers with some works.

Finance 1. You are now 20 years old and just beginning to save for retirement. If your retirement account will earn 6% compounded monthly and you plan to retire at the age of 50 with $1,200,000. How much do you need to invest each month in order to reach your retirement goal? 2. What if you retire at age 50 but live forever? (from 1) 3. You are the winner of \"Lottery Powerball\