You just turned 30 and decide that you would like to save up enough money so as to be able to withdraw $75,000 per year for 20 years when you retire at age 65, with the first withdrawal starting on your 66^th birthday. How much money will you have to deposit each month into an account earning 8% per year (interest compounded monthly), starting one month from today, to accomplish this goal?

I need to know how to calculate this not just the answer, please.