You have $10,000 in your retirement account, and you believe you can save $200/month, and earn 8% APR (compounded monthly) for the next 40 years. How much money you would have in your retirement account in 40 years?

Same conditions as above, but you want to end up with $5,000,000 in your account in 40 years. If you keep saving $200/month, what kind of return you need to get to achieve your goal?

Same conditions as above, but this time you earn 8% APR (compounded monthly) , and still want to retire as soon as you have $5,000,000 in your account while saving $200/month. How long you will have to wait to retire?